2021 Mercedes-Benz B-Class: Premium Features

The 2021 Mercedes-Benz B-Class elevates the compact MPV segment by blending everyday practicality with hallmark Mercedes luxury and technology. Designed for those who prioritize comfort, safety, and intelligent design, it combines a higher seating position with agile handling and refined efficiency. Built on the MFA2 platform shared with the A-Class, the B-Class delivers smooth performance through advanced turbocharged powertrains, while the cabin showcases the cutting-edge MBUX infotainment system, premium materials, and excellent visibility. The result is a family-friendly vehicle that offers versatility without sacrificing sophistication, embodying Mercedes-Benz’s modern interpretation of compact luxury.

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What’s New in the 2021 Mercedes-Benz B-Class: Design and Technology Updates

The 2021 Mercedes-Benz B-Class received a series of refinements that further enhance its balance between functionality, style, and innovation. While maintaining its familiar silhouette as a compact luxury MPV, this model year focuses on subtle design improvements, smarter technology integration, and expanded standard features across the range.

Updated Exterior Design and Aerodynamics

Mercedes-Benz introduced minor but impactful exterior updates to the B-Class in 2021, emphasizing a more dynamic and aerodynamic profile. The front fascia now features a sharper grille pattern with chrome accents, flanked by LED headlamps that integrate more fluidly into the design. At the rear, updated LED taillight graphics and a slightly re-sculpted bumper improve visual width and stability.

The roofline remains slightly arched to preserve cabin space, while the short overhangs and streamlined A-pillars contribute to a drag coefficient of 0.26 Cd, making the B-Class one of the most aerodynamically efficient vehicles in its segment.

Design Element	Feature	Benefit
Headlights	Full-LED with integrated DRLs	Improved illumination and modern look
Grille	Chrome pins with horizontal slats	Enhanced visual width
Wheels	16–19 inch alloy designs	Sportier stance and improved grip
Aerodynamics	0.26 Cd coefficient	Better efficiency and quieter ride

Interior Refinement and Comfort Enhancements

Inside, the 2021 B-Class evolves with a stronger emphasis on perceived quality and digital sophistication. The dual-screen MBUX display setup—available in configurations up to 10.25 inches per screen—creates a cohesive digital cockpit. High-grade materials such as Artico leatherette upholstery, brushed aluminum trim, and soft-touch panels elevate the premium atmosphere.

New seat ergonomics improve comfort on long drives, and an optional ENERGIZING Comfort package links climate control, ambient lighting, and seat functions to enhance well-being. The rear seat design offers improved thigh support and easier recline angles, reflecting Mercedes’ attention to everyday usability.

Technology and Feature Additions

The MBUX (Mercedes-Benz User Experience) system gains faster processing power and an expanded voice command range for 2021. Commands such as “Hey Mercedes, I’m cold” or “Navigate to work” activate corresponding adjustments automatically. Wireless smartphone integration via Apple CarPlay and Android Auto is now standard across all trims.

A notable addition is the expanded Advanced Driver Assistance Package, which includes Active Distance Assist DISTRONIC, Active Steering Assist, and Automatic Lane Change for improved semi-autonomous driving capability.

New Technology	Description	Function
MBUX AI Assistant	Learns driver habits	Personalized infotainment experience
Digital Instrument Cluster	Up to 10.25” display	Fully customizable view
DISTRONIC with Stop-and-Go	Adaptive cruise with steering assist	Enhanced driver comfort in traffic
Over-the-Air Updates	Software enhancement	Continuous improvement of system features

Model Lineup and Equipment

The 2021 lineup includes B180, B200, and B250 petrol variants, as well as B200d and B220d diesel options in selected markets. Each model benefits from improved standard safety features, upgraded interior finishes, and expanded wheel options. The Progressive, AMG Line, and Electric Art trims cater to varying tastes, from minimalist elegance to sporty flair.

Highlights

• Revised LED lighting design and aerodynamic improvements
• Upgraded MBUX infotainment with smarter voice control
• Enhanced driver assistance systems for semi-autonomous driving
• Premium interior updates with new comfort options
• Streamlined model lineup for clarity and efficiency

In summary, the 2021 Mercedes-Benz B-Class refines an already successful formula with modernized design, advanced digital capability, and improved comfort, reinforcing its reputation as the intelligent compact MPV for modern lifestyles.

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Engine and Performance Review: Efficiency and Driving Dynamics

The 2021 Mercedes-Benz B-Class delivers a polished balance between performance and efficiency, embodying the refined engineering that defines the brand’s compact lineup. With a diverse range of turbocharged petrol and diesel engines, advanced transmissions, and optional 4MATIC all-wheel drive, the B-Class offers smooth acceleration, confident handling, and exceptional fuel economy for its category.

Engine Lineup and Technical Specifications

The 2021 B-Class offers multiple engine options tailored for different driving styles and efficiency needs. The most popular variants include the B180, B200, and B250 in the petrol range, alongside the B200d and B220d diesel models. Each uses direct injection and turbocharging technology to maximize output while minimizing emissions.

Variant	Engine Type	Power Output	Torque	Transmission	0–100 km/h	Drivetrain
B180	1.3L Turbo (M282)	136 hp	200 Nm	7G-DCT Auto	9.0 s	FWD
B200	1.3L Turbo (M282)	163 hp	250 Nm	7G-DCT Auto	8.2 s	FWD
B250	2.0L Turbo (M260)	224 hp	350 Nm	8G-DCT Auto	6.4 s	FWD / 4MATIC
B200d	2.0L Diesel (OM654q)	150 hp	320 Nm	8G-DCT Auto	8.4 s	FWD
B220d	2.0L Diesel (OM654q)	190 hp	400 Nm	8G-DCT Auto	7.2 s	FWD / 4MATIC

The M282 engine, co-developed with Renault, delivers quiet operation and strong mid-range power, while the OM654q diesel engines are among the cleanest in their class, compliant with Euro 6d emissions standards. The top-tier B250 4MATIC provides sportier acceleration, combining performance and traction with all-weather confidence.

Transmission and Drivetrain

Depending on the variant, the B-Class is equipped with either the 7G-DCT dual-clutch automatic or the 8G-DCT gearbox, both designed for seamless shifting and fuel efficiency. Gear changes are quick and unobtrusive, with downshifts executed intelligently when extra power is needed.

The available 4MATIC all-wheel-drive system distributes torque automatically between the front and rear axles, optimizing traction on wet or slippery surfaces without sacrificing efficiency. This system makes the B250 4MATIC especially versatile for varied weather and road conditions.

Performance and Driving Character

On the road, the B-Class feels agile and composed. The electric power steering provides accuracy with light feedback in city driving and improved weight at higher speeds. The suspension setup, using a MacPherson strut front and multi-link rear design, ensures a comfortable yet planted ride, even on uneven pavement.

In corners, the B-Class demonstrates balanced dynamics. The AMG Line trim enhances stability further with firmer damping, lowered suspension, and larger wheels, making it sharper in handling without compromising ride comfort.

Driving Aspect	Description	Result
Steering	Electric power-assisted, variable ratio	Precise and responsive
Suspension	MacPherson front / multi-link rear	Balanced comfort and agility
Braking System	Ventilated disc setup	Confident stopping power
NVH Refinement	Acoustic insulation and engine mounts	Reduced cabin noise and vibration

Fuel Economy and Emissions

Efficiency remains a strong point across the lineup. The B180 achieves approximately 5.7 L/100 km (41 mpg), while the B220d can return as low as 4.4 L/100 km (53 mpg) under WLTP testing. Start/stop technology, optimized aerodynamics, and lightweight engine components all contribute to lower emissions and better real-world fuel performance.

Variant	Combined Fuel Economy (WLTP)	CO₂ Emissions
B180	5.7 L/100 km	131 g/km
B200	5.8 L/100 km	134 g/km
B250	6.5 L/100 km	149 g/km
B200d	4.5 L/100 km	118 g/km
B220d	4.4 L/100 km	115 g/km

Highlights

• Efficient turbocharged petrol and diesel engines with Euro 6d compliance
• Smooth dual-clutch transmissions for refined performance
• Available 4MATIC AWD enhances all-weather confidence
• Balanced ride quality through multi-link suspension tuning
• Strong fuel efficiency and low emissions across the lineup

In summary, the 2021 Mercedes-Benz B-Class demonstrates how practicality and performance can coexist. Its range of refined turbo engines, responsive transmission, and balanced dynamics make it one of the most capable and efficient compact luxury MPVs available today.

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Driving Experience and Handling: Comfort, Agility, and Ride Balance

The 2021 Mercedes-Benz B-Class delivers a driving experience that harmoniously combines refinement, confidence, and composure. Built upon the same MFA2 platform as the A-Class, it benefits from a low center of gravity, precise steering, and advanced chassis tuning, resulting in a vehicle that feels stable and responsive—ideal for both city commuting and long-distance touring.

Ride Comfort and Suspension Setup

Mercedes-Benz engineers designed the B-Class to prioritize comfort without losing agility. The MacPherson strut front suspension and multi-link rear suspension configuration deliver excellent ride isolation, absorbing bumps and uneven surfaces with ease. The suspension calibration varies slightly depending on trim:

• Standard models (B180, B200) use a comfort-oriented setup with soft damping for smooth daily driving.
• AMG Line versions feature lowered suspension and firmer springs, offering more responsive handling for drivers seeking sportier feedback.

The optional adaptive damping system allows drivers to adjust suspension stiffness via the Dynamic Select system, which tailors ride quality between Comfort and Sport modes. This adjustability helps the B-Class transition seamlessly between relaxed cruising and energetic cornering.

Mode	Steering Feel	Suspension	Response
Comfort	Light	Soft	Relaxed for urban or highway use
Sport	Heavier	Firm	Sharper cornering and throttle response
Eco	Light	Soft	Prioritizes efficiency

Steering Precision and Stability

The electric power steering system in the 2021 B-Class provides accurate feedback and smooth control. Steering ratios are optimized for both maneuverability in tight spaces and stability at higher speeds. On winding roads, the car feels composed and predictable, aided by the balanced weight distribution and rigid chassis design.

The 4MATIC all-wheel-drive variant enhances cornering precision further, subtly adjusting torque distribution between the axles for additional grip and control. Combined with ESP (Electronic Stability Program) and Cornering Brake Control, the system ensures confident handling even in challenging weather conditions.

Braking and NVH Refinement

The B-Class features ventilated disc brakes at all four corners, delivering consistent stopping performance. The electronic brake assist system optimizes pressure for emergency stops, while auto hold functionality prevents rollback on inclines.

Noise, vibration, and harshness (NVH) levels are impressively low. Mercedes-Benz employed acoustic insulation, optimized engine mounts, and aerodynamic sealing to minimize external noise. On highways, the cabin remains hushed, contributing to the sense of premium refinement expected from the brand.

Component	Technology	Effect
Steering	Electric power assist	Smooth and responsive control
Chassis	Lightweight MFA2 platform	Better balance and rigidity
Brakes	Ventilated discs, ABS, EBD	Strong and consistent braking
Cabin Insulation	Acoustic windshield and panels	Quiet, refined ride quality

Driving Character and Long-Distance Comfort

The B-Class performs exceptionally well as a long-distance cruiser. The high seating position provides excellent visibility, while supportive seats and ergonomic cabin design reduce fatigue on extended trips. The car’s stability at highway speeds is enhanced by aerodynamic efficiency and a drag coefficient of 0.26 Cd, making it quieter and more fuel-efficient than most rivals.

In urban environments, its compact footprint and tight turning radius (11 m) make parking and maneuvering effortless. The 7G-DCT and 8G-DCT transmissions respond smoothly to throttle input, maintaining seamless acceleration during stop-and-go traffic.

Highlights

• Balanced suspension setup offers both comfort and precision
• Adaptive damping system available for customizable handling
• 4MATIC AWD provides secure grip in all conditions
• Quiet and composed cabin ensures luxury-level refinement
• Excellent visibility and ergonomics enhance driver confidence

In conclusion, the 2021 Mercedes-Benz B-Class delivers an experience that blends comfort with control. Its composed suspension, precise steering, and hushed cabin create a driving environment that feels distinctly Mercedes—refined, capable, and perfectly suited to both daily commuting and weekend escapes.

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Interior Design and Comfort: Materials, Seating, and Practicality

The 2021 Mercedes-Benz B-Class distinguishes itself through an interior that merges sophistication, ergonomic excellence, and practicality. Its cabin layout reflects the brand’s commitment to combining everyday usability with luxury craftsmanship, making it an ideal option for families and professionals seeking both refinement and versatility.

Cabin Design and Layout

Inside, the B-Class exudes a premium ambiance typically associated with larger Mercedes models. The dashboard adopts a wide horizontal layout with integrated turbine-style air vents, emphasizing width and space. The floating MBUX dual-display setup, available in 7-inch or 10.25-inch configurations, dominates the cockpit, blending technology with aesthetics.

Soft-touch materials cover most surfaces, complemented by polished aluminum trim, piano black inserts, and customizable ambient LED lighting offering up to 64 colors. The elevated seating position enhances forward visibility, while the compact center console frees up legroom for both driver and passenger.

Interior Element	Feature	Benefit
Dashboard	Wide layout with turbine vents	Airy and modern design
Infotainment	MBUX dual-screen system	Seamless digital control
Materials	Soft-touch plastics, Artico leatherette	Premium tactile quality
Lighting	64-color ambient illumination	Customizable interior atmosphere

Seating Comfort and Ergonomics

The 2021 B-Class offers outstanding seating comfort, a hallmark of Mercedes-Benz interiors. The front seats feature multiple adjustment options, including lumbar support and seat cushion tilt, allowing for fine-tuned comfort on long journeys. The rear seats are equally accommodating, offering generous headroom and legroom for adult passengers—a key advantage of the car’s tall cabin design.

Available Artico man-made leather upholstery provides durability and a refined touch, while optional leather or microfiber combinations enhance luxury further. Seat firmness strikes an ideal balance between support and softness, making the cabin equally suitable for extended drives and urban commuting.

Seating Area	Headroom	Legroom	Shoulder Room
Front	1,035 mm	1,062 mm	1,450 mm
Rear	985 mm	975 mm	1,440 mm

The rear seatbacks recline and fold in a 40:20:40 split, expanding versatility for carrying larger items without sacrificing passenger comfort. An optional sliding rear bench provides up to 140 mm of fore-aft movement, allowing owners to prioritize either rear passenger space or cargo volume.

Material Quality and Build Precision

Material selection in the B-Class is impressive for its class. Mercedes employs high-quality thermo-coated plastics, brushed aluminum, and stitched surfaces throughout the cabin. Door panels feel solid, and the fit-and-finish consistency underscores the brand’s meticulous build standards.

Noise insulation is excellent, with acoustic glass and strategically placed sound-deadening materials ensuring quiet operation even at highway speeds. The result is a serene environment that enhances the sense of luxury and isolation from external noise.

Storage and Practical Features

Despite its premium focus, the B-Class remains one of the most practical vehicles in the Mercedes range. The cabin offers multiple storage compartments, including deep door bins, a large glovebox, and a two-level center console tray.

The cargo capacity stands at 455 liters with the rear seats upright, expanding to 1,540 liters with them folded. The low load floor and wide tailgate opening simplify loading bulky items, while the hands-free Easy-Pack power tailgate adds convenience for everyday use.

Configuration	Cargo Capacity
Seats Up	455 L
Rear Seats Folded	1,540 L
Underfloor Storage	40 L

Practical touches include rear-seat USB ports, multiple cup holders, and a 12V outlet in the trunk—small but valuable additions that reinforce the vehicle’s family-friendly design.

Highlights

• Premium materials and refined craftsmanship across all trims
• Spacious interior with high seating position and great visibility
• Adjustable rear bench adds flexibility for cargo or passenger needs
• MBUX dual-screen cockpit blends technology with elegance
• Excellent noise insulation for a quiet, relaxed cabin environment

In essence, the 2021 Mercedes-Benz B-Class transforms practicality into luxury. It’s a thoughtfully designed interior where every detail—from material quality to seat comfort—reflects Mercedes’ mastery of combining everyday usability with modern elegance.

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Safety and Assistance Systems: Advanced Mercedes-Benz Protection

The 2021 Mercedes-Benz B-Class is engineered with safety as a foundational principle, offering a combination of advanced driver assistance technologies, intelligent sensors, and structural integrity that exemplify the brand’s pursuit of occupant protection. Drawing from Mercedes’ experience in higher segments, the B-Class integrates active and passive safety systems that elevate it beyond typical compact MPV standards.

Active Safety: Mercedes-Benz Intelligent Drive

The Mercedes-Benz Intelligent Drive suite equips the B-Class with a range of semi-autonomous systems that continuously monitor the environment to assist the driver in critical situations. Using radar, cameras, and ultrasonic sensors, these features actively intervene when necessary to reduce accident risk.

Feature	Function	Driver Benefit
Active Brake Assist	Detects collision risk and applies braking automatically	Reduces severity of or prevents frontal collisions
Active Distance Assist DISTRONIC	Maintains distance from vehicles ahead, including stop-and-go traffic	Less driver fatigue in congestion
Active Steering Assist	Provides gentle corrections to keep the vehicle centered in its lane	Enhances stability and precision
Blind Spot Assist	Alerts the driver of vehicles in blind zones	Safer lane changes
Traffic Sign Assist	Detects and displays speed limits and restrictions	Keeps driver informed and compliant
Crosswind Assist	Stabilizes vehicle during strong side winds	Improved safety on highways

The Active Distance Assist DISTRONIC is especially useful in urban driving or heavy traffic, automatically adjusting the car’s speed based on surrounding vehicles. Combined with Stop-and-Go function, it provides semi-autonomous driving capability for short periods, significantly reducing driver fatigue.

Passive Safety and Structural Design

Beyond electronics, the B-Class employs Mercedes’ renowned Rigid Passenger Cell Architecture, designed with multiple load paths to distribute impact forces evenly. The body shell incorporates high-strength steel reinforcements, while deformation zones absorb energy during collisions to minimize cabin intrusion.

The vehicle comes standard with seven airbags, including front, side, and curtain airbags, and a driver’s knee airbag for lower-body protection. The front seats are equipped with seatbelt pretensioners and load limiters, while active head restraints help mitigate whiplash injuries in rear impacts.

Component	Description	Function
Passenger Cell	Rigid multi-path structure	Distributes crash energy safely
Airbag System	7 total airbags including driver knee	Comprehensive occupant protection
PRE-SAFE® System	Prepares vehicle for imminent impact	Tightens belts, closes windows automatically
ISOFIX Anchors	Standard on rear seats	Secure child seat installation

The PRE-SAFE® system, a signature Mercedes safety innovation, detects imminent collisions and automatically initiates protective measures such as closing windows, adjusting seats, and tightening seatbelts to prepare occupants for impact.

Driver Attention and Assistance Monitoring

The ATTENTION ASSIST system monitors driver behavior and steering input patterns to detect signs of drowsiness or distraction. If fatigue is detected, it provides an audible and visual alert, suggesting a rest stop. Adaptive Highbeam Assist and Automatic Emergency Call (eCall) are also standard, ensuring the vehicle can automatically contact emergency services if an accident occurs.

Lighting and Visibility Systems

Lighting technology contributes significantly to safety in the B-Class. The LED High Performance headlamps provide wide and natural illumination with automatic beam adjustment. The Adaptive Highbeam Assist Plus feature dynamically shields oncoming traffic while maintaining maximum brightness elsewhere. LED rear lamps enhance visibility and quick response times for drivers following behind.

Safety Ratings and Recognition

The 2021 B-Class received a 5-star Euro NCAP safety rating, achieving high scores for adult and child occupant protection, as well as advanced safety technology performance. This confirms its position as one of the safest vehicles in its class.

Highlights

• Mercedes-Benz Intelligent Drive suite with semi-autonomous capabilities
• PRE-SAFE® system proactively protects occupants before a collision
• 7-airbag configuration and strong passenger cell design
• Active Distance Assist DISTRONIC with Stop-and-Go for urban driving
• 5-star Euro NCAP safety rating, ensuring class-leading protection

In conclusion, the 2021 Mercedes-Benz B-Class redefines safety in the compact segment. Through a blend of proactive driver assistance, intelligent structural engineering, and Mercedes’ cutting-edge safety philosophy, it delivers exceptional confidence and peace of mind for every journey.

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Technology and Infotainment: MBUX Intelligence and Digital Experience

The 2021 Mercedes-Benz B-Class represents the cutting edge of digital innovation within the compact luxury class. Centered around the acclaimed MBUX (Mercedes-Benz User Experience) system, it integrates artificial intelligence, natural voice interaction, and customizable digital displays to deliver a refined and intuitive user experience. Whether controlling navigation, entertainment, or vehicle settings, MBUX ensures the interface feels intelligent, responsive, and seamlessly connected to modern lifestyles.

The MBUX System and Digital Cockpit

At the heart of the B-Class’s technological appeal is the MBUX infotainment platform, powered by an advanced NVIDIA processor and Mercedes’ proprietary UX design. It’s offered in two display configurations: dual 7-inch screens as standard or 10.25-inch high-resolution displays in higher trims. The system combines a fully digital instrument cluster with a central multimedia interface, creating a cohesive and futuristic cockpit.

Drivers can interact with MBUX through touch, gesture, or voice command. The “Hey Mercedes” voice assistant allows natural speech commands for navigation, climate control, and entertainment. Over time, the AI learns user preferences—such as regular destinations or favorite radio stations—and adjusts automatically.

Feature	Description	Benefit
MBUX Voice Control	Natural language understanding	Hands-free operation
Dual Display Setup	Up to 10.25-inch screens	Immersive digital experience
AI Learning Capability	Remembers user patterns	Personalized responses
Touch & Gesture Inputs	Multiple control options	Enhanced flexibility

Connectivity and Integration

The B-Class keeps occupants connected through a comprehensive suite of digital connectivity options. Apple CarPlay and Android Auto come standard, providing seamless smartphone integration. Additionally, Bluetooth HandsFreeLink, USB-C ports, and wireless charging support keep devices powered and synced at all times.

The Mercedes me connect app extends vehicle control beyond the cabin, allowing users to check fuel levels, lock or unlock doors, and even pre-condition the cabin temperature remotely. It also provides real-time diagnostics and maintenance reminders, enhancing long-term usability and convenience.

Connectivity Feature	Function	Availability
Apple CarPlay / Android Auto	Smartphone mirroring	Standard
Wireless Charging	Qi-compatible device charging	Optional
Mercedes me connect	Remote vehicle access	Standard
USB-C Ports	Device power and data	All trims

Navigation and Digital Services

The MBUX Navigation system integrates 3D mapping, augmented reality (AR) overlays, and live traffic updates to make driving both simpler and safer. The AR function displays directional arrows directly on a live front camera feed, visually aligning navigation prompts with real-world streets.

Additional Live Traffic Information and Car-to-X communication allow the B-Class to receive alerts from other connected vehicles about road hazards, accidents, or adverse weather, improving route safety and efficiency.

Audio System and Entertainment

Standard sound quality is excellent, but for those seeking higher fidelity, the optional Burmester® Surround Sound System offers premium acoustics through 12 high-performance speakers and a 590-watt digital amplifier. This system creates an immersive listening experience with crisp treble and deep bass—comparable to larger Mercedes sedans.

The infotainment system also supports online radio streaming, USB music playback, and HD radio, ensuring every journey is accompanied by rich audio quality.

Ambient and Digital Customization

The cabin’s technological ambiance is complemented by 64-color ambient lighting, allowing users to synchronize lighting tones with drive modes or personal preferences. The digital instrument cluster can be customized with three main display themes: Classic, Sport, and Progressive, ensuring the driver’s interface feels both personal and informative.

Display Mode	Theme	Use Case
Classic	Traditional gauges	Balanced everyday driving
Sport	Dynamic red highlights	Engaging highway drives
Progressive	Minimal, futuristic interface	Night or relaxed driving

Highlights

• MBUX system with AI-powered voice control and dual-screen setup
• Apple CarPlay, Android Auto, and Mercedes me connect standard
• Augmented Reality Navigation and real-time traffic updates
• Optional Burmester® Surround Sound System for audiophile quality
• Customizable digital cockpit and ambient lighting for personalization

In essence, the 2021 Mercedes-Benz B-Class transforms the in-car experience into a seamless digital ecosystem. From intelligent voice assistance to immersive entertainment and navigation, it delivers a level of connectivity and sophistication that redefines expectations for compact luxury vehicles.

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Fuel Efficiency and Environmental Performance: Economy and Sustainability

The 2021 Mercedes-Benz B-Class demonstrates how a premium compact MPV can blend performance with responsible efficiency. Through a combination of lightweight engineering, refined turbocharged engines, and advanced start/stop systems, the B-Class delivers strong fuel economy and low emissions without compromising Mercedes-Benz’s hallmark refinement and power delivery.

Fuel Economy Ratings and Real-World Efficiency

The 2021 B-Class lineup offers excellent fuel efficiency across its petrol and diesel variants. Thanks to direct injection technology and optimized dual-clutch transmissions, fuel consumption figures remain competitive in both city and highway driving.

Variant	Transmission	Fuel Economy (Combined WLTP)	CO₂ Emissions	Fuel Type
B180	7G-DCT	5.7 L/100 km	131 g/km	Petrol
B200	7G-DCT	5.8 L/100 km	134 g/km	Petrol
B250 (4MATIC)	8G-DCT	6.5 L/100 km	149 g/km	Petrol
B200d	8G-DCT	4.5 L/100 km	118 g/km	Diesel
B220d	8G-DCT	4.4 L/100 km	115 g/km	Diesel

In real-world testing, the diesel models consistently deliver between 5.0–5.2 L/100 km, making them ideal for long-distance travelers, while the petrol variants achieve around 6.0–6.3 L/100 km depending on driving conditions and load.

The start/stop function operates seamlessly in traffic, cutting the engine at idle to conserve fuel. When paired with the Eco drive mode within the Dynamic Select system, it optimizes throttle sensitivity, air conditioning, and transmission shifts to achieve maximum economy.

Aerodynamic Efficiency and Lightweight Design

Aerodynamics play a vital role in the B-Class’s efficiency performance. Its body design—shaped using computer fluid dynamics—achieves a drag coefficient of 0.26 Cd, one of the best in its segment. Features such as active grille shutters, air-curtain ducts, and flush underbody panels minimize air resistance and improve highway fuel economy.

Additionally, the use of high-strength aluminum and steel composites reduces weight while maintaining rigidity. This design approach not only enhances fuel economy but also improves handling and overall ride comfort.

Efficiency Element	Description	Effect
Drag Coefficient	0.26 Cd	Reduced wind resistance
Active Grille Shutters	Adjust airflow based on cooling needs	Lower fuel consumption
Lightweight Components	Aluminum suspension and panels	Better agility and efficiency
Low-Rolling-Resistance Tires	Optimized tread compound	Improved highway economy

Engine Technology and Emission Reduction

The B-Class engines are engineered to meet the strict Euro 6d emissions standards, reducing nitrogen oxide (NOx) and particulate output. Both petrol and diesel variants employ particulate filters and selective catalytic reduction (SCR) systems with AdBlue injection, ensuring compliance with global environmental regulations.

The OM654q diesel engines, built on Mercedes’ latest modular platform, are particularly efficient. Their steel piston and aluminum block combination minimize internal friction and enhance combustion efficiency. The high-pressure common-rail system ensures precise fuel delivery, balancing power and clean emissions.

Eco Assist and Driving Optimization

The Eco Assist system provides real-time feedback to help drivers adopt fuel-efficient habits. It analyzes traffic data, road gradient, and speed limits, then recommends coasting or reduced throttle inputs when appropriate. The system also integrates with MBUX navigation, suggesting eco-friendly routes with fewer elevation changes and smoother traffic flow.

Environmental Impact and Sustainability Efforts

Beyond fuel economy, the B-Class reflects Mercedes-Benz’s broader commitment to sustainability. The vehicle incorporates recycled plastics in non-visible interior components and water-based paints to minimize environmental impact. Mercedes-Benz’s production facilities for the B-Class are certified carbon-neutral, with power sourced from renewable energy where possible.

Highlights

• Fuel-efficient turbo engines with advanced injection and start/stop systems
• Exceptional aerodynamics (0.26 Cd) for reduced drag and noise
• Eco Assist system actively supports efficient driving habits
• Euro 6d-compliant engines minimize harmful emissions
• Use of recycled materials and sustainable manufacturing practices

In summary, the 2021 Mercedes-Benz B-Class proves that luxury and sustainability can coexist. Its intelligent engine management, aerodynamic excellence, and low emissions make it one of the most eco-conscious options in the premium compact segment—delivering efficiency without sacrificing the refinement expected of a Mercedes-Benz.

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Dimensions and Practical Space: Cargo and Family Usability

The 2021 Mercedes-Benz B-Class continues to excel as one of the most practical and family-friendly vehicles in the compact premium segment. Built on the MFA2 platform, it maximizes cabin space and utility while maintaining a refined and elegant appearance. The B-Class seamlessly blends functionality with the luxury expected from Mercedes-Benz, making it a versatile option for daily use, long journeys, and active lifestyles.

Exterior Dimensions and Proportions

Although compact in classification, the B-Class offers generous proportions that contribute to excellent interior space and road presence. Its upright stance and high roofline enhance practicality without compromising style.

Dimension	Measurement
Overall Length	4,419 mm (174.0 in)
Width	1,796 mm (70.7 in)
Height	1,562 mm (61.5 in)
Wheelbase	2,729 mm (107.4 in)
Ground Clearance	134 mm (5.3 in)
Turning Circle	11.0 m (36.1 ft)

These measurements translate to easy maneuverability in tight urban settings, while the long wheelbase ensures stable highway dynamics and a spacious cabin.

Cabin Space and Passenger Comfort

Inside, the B-Class provides one of the roomiest interiors in its category. The elevated seating position and intelligently designed cabin layout allow both front and rear passengers to enjoy generous space and excellent visibility.

Seating Area	Headroom	Legroom	Shoulder Room
Front	1,035 mm	1,062 mm	1,450 mm
Rear	985 mm	975 mm	1,440 mm

The wide-opening doors and high roofline simplify ingress and egress, while the rear seat height allows for comfortable posture even on long trips. Families will appreciate the ISOFIX mounting points on both rear outboard seats, enabling quick and secure child-seat installation.

Cargo Space and Practical Features

The cargo area is designed to accommodate both everyday errands and weekend adventures. Offering 455 liters of boot space with the rear seats in place, it expands to 1,540 liters with them folded flat, thanks to the 40:20:40 split-folding rear seatback. The load floor is low and flat, making it easy to lift heavy items or load large luggage.

Cargo Configuration	Volume
Seats Up	455 L
Rear Seats Folded	1,540 L
Hidden Underfloor Storage	40 L

The adjustable boot floor adds flexibility, allowing owners to switch between a deeper storage area or a level loading surface. Additionally, the Easy-Pack power tailgate with hands-free access enables effortless opening and closing—particularly useful when your hands are full.

Everyday Usability and Storage Solutions

Mercedes engineers paid close attention to small-item storage and cabin practicality. The B-Class includes large door pockets, a spacious glove compartment, and multiple cup holders in both rows. The center console features a configurable storage tray and USB-C ports for passengers.

Additional convenience features include:

• Rear-seat armrest with integrated cup holders
• 12V trunk outlet for portable coolers or accessories
• Low loading sill for easy access
• Sliding rear bench (optional) for flexible passenger-cargo balance

Versatility and Family Focus

The elevated ride height not only improves outward visibility but also makes it easier to install child seats or load bulky items. Combined with climate vents for the rear seats, ambient lighting, and soft-close storage compartments, the B-Class caters to both comfort and practicality.

Its wide-opening rear doors and high cabin roofline are especially beneficial for families, elderly passengers, or drivers seeking everyday convenience without switching to a full-size SUV.

Highlights

• Spacious cabin and versatile cargo area up to 1,540 liters
• Flat load floor and adjustable trunk height for convenience
• Sliding rear seats and 40:20:40 split-folding design
• Hands-free power tailgate and multiple cabin storage points
• Excellent visibility and accessibility for all passengers

In summary, the 2021 Mercedes-Benz B-Class redefines practicality in the premium compact class. Its thoughtful packaging, family-friendly ergonomics, and versatile storage solutions make it one of the most functional yet refined vehicles for everyday use—perfectly suited for modern urban and family life.

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Common Issues and Reliability Insights: Owner Reports and Long-Term Quality

The 2021 Mercedes-Benz B-Class is widely regarded as one of the most reliable compact luxury MPVs in its segment, reflecting Mercedes-Benz’s long-standing commitment to engineering quality. While the model’s overall dependability is high, a few minor issues have been reported by owners and reviewers, primarily related to software or electronic systems rather than mechanical defects.

Overall Reliability and Powertrain Performance

The B-Class (W247) shares its MFA2 platform and engine lineup with the A-Class and CLA, both known for solid reliability records. The M282 1.3L turbocharged petrol and OM654q 2.0L diesel engines have proven durable and efficient, with minimal complaints regarding major component failures. Regular servicing and use of high-quality fuel ensure consistent performance and longevity.

Area	Common Concern	Frequency	Typical Solution
Engine (M282)	Occasional vibration on cold start	Low	Normal operating behavior or ECU update
Transmission (7G-DCT)	Slight delay at low speeds	Moderate	Software reflash improves shift logic
Diesel Models	AdBlue sensor malfunction	Rare	Covered under warranty replacement
AWD System (4MATIC)	Clicking sound from rear differential	Rare	Lubrication service by dealer

Overall, owners report that the B-Class performs well over long-term use, with engine components and transmission systems showing excellent reliability when maintained according to Mercedes’ official schedule.

Electrical and Infotainment-Related Issues

As with many modern vehicles equipped with complex infotainment and driver-assistance technologies, the MBUX system may occasionally present minor software glitches. The most frequently noted issues include slow boot-up times or temporary Bluetooth disconnections.

Component	Issue	Impact	Resolution
MBUX System	Delayed touchscreen response	Minor	Software update or system reset
Apple CarPlay	Intermittent disconnection	Low	Update via dealership
Parking Sensors	False proximity alerts in heavy rain	Low	Sensor recalibration
Keyless Entry	Weak signal recognition	Rare	Battery replacement in key fob

Mercedes-Benz periodically releases over-the-air updates or in-dealer firmware upgrades to address such software bugs, improving responsiveness and stability.

Build Quality and Interior Durability

Interior durability is a strong point for the 2021 B-Class. The soft-touch dashboard, seat upholstery, and trim elements show excellent wear resistance over time. However, some owners note minor rattles or creaks developing in door panels or the dashboard area, typically after extended use on rough roads.

These noises are usually resolved through dealer adjustments or the use of additional insulation materials. The paint quality and exterior finishes maintain their luster well, even under harsh weather exposure, provided proper care is taken.

Recalls and Technical Service Bulletins

The 2021 B-Class has not been subject to any major global recalls as of 2025. Minor Technical Service Bulletins (TSBs) have been issued to address:

• Transmission software optimization for smoother gear transitions.
• Infotainment updates to improve MBUX connectivity stability.
• AdBlue system sensor recalibration in certain diesel models.

These updates are routinely applied during scheduled maintenance and typically do not require additional owner intervention.

Long-Term Ownership and Customer Satisfaction

Long-term owners report high satisfaction levels, praising the B-Class for its refined ride, low maintenance requirements, and premium comfort. Reliability surveys place the model above the segment average, particularly for mechanical dependability. Residual values remain strong thanks to Mercedes-Benz’s brand reputation and consistent build quality.

Reliability Category	Owner Rating (out of 5)
Engine & Transmission	4.7
Electrical Systems	4.3
Interior Build Quality	4.6
Infotainment Stability	4.2
Overall Satisfaction	4.5

Highlights

• Highly reliable powertrains with proven longevity
• Minor software issues easily resolved via updates
• Strong build quality with minimal aging effects
• No major recalls and proactive TSB support
• High owner satisfaction for comfort and dependability

In summary, the 2021 Mercedes-Benz B-Class delivers outstanding reliability in both mechanical and electronic aspects. While small software-related concerns may arise, they are minor and well-managed by Mercedes’ service network. Its overall engineering integrity ensures a long and trouble-free ownership experience, consistent with the brand’s premium standards.

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Maintenance and Ownership Experience: Service, Longevity, and Value

The 2021 Mercedes-Benz B-Class is designed to provide a premium yet low-stress ownership experience, with predictable maintenance intervals, strong reliability, and impressive long-term value retention. Mercedes-Benz combines advanced engineering with efficient service management, ensuring that owning a B-Class remains both convenient and cost-effective compared to other luxury vehicles in its class.

Routine Maintenance and Service Intervals

Mercedes-Benz utilizes the ASSYST Plus maintenance system, an intelligent on-board service reminder that monitors mileage, driving style, and time intervals to determine when service is due. This adaptive system optimizes maintenance schedules, preventing unnecessary visits while maintaining component longevity.

Service Item	Recommended Interval	Notes
Engine Oil & Filter	Every 15,000 km or annually	Use MB 229.5-approved synthetic oil
Cabin Air Filter	Every 20,000 km	Essential for HVAC efficiency
Engine Air Filter	Every 30,000 km	Replace sooner in dusty environments
Brake Fluid	Every 2 years	Prevents moisture buildup
Transmission Fluid	Every 60,000 km	Maintain smooth shifting on DCT models
Coolant	Every 100,000 km or 5 years	Use genuine Mercedes coolant
AdBlue Fluid (Diesel)	As needed	Check warning indicator on dash

The dual-clutch transmissions (7G-DCT and 8G-DCT) require only periodic fluid changes and calibration checks, keeping maintenance costs relatively low. Diesel models benefit from long oil-change intervals and durable timing chains, further reducing ownership expenses.

Service Costs and Warranty Coverage

Average maintenance costs for the 2021 B-Class fall between $400–$650 per year, depending on region and driving conditions—remarkably affordable for a premium brand. Mercedes-Benz offers ServiceCare prepaid maintenance packages, which cover routine servicing at a fixed cost, protecting owners from inflation and ensuring genuine parts are used.

Ownership Factor	Detail	Benefit
Annual Maintenance Cost	$400–$650 (approx.)	Predictable, low-cost upkeep
Warranty	3 years / 100,000 km (standard)	Comprehensive coverage
Extended Warranty	Up to 5 years / 160,000 km	Available through dealers
ServiceCare Plan	Prepaid maintenance	Fixed pricing, genuine parts
24-Hour Roadside Assistance	Included with purchase	Free towing and breakdown support

Owners who opt for Mercedes-Benz ExtendedCare gain additional protection for major systems, including engine, transmission, and electronic modules—ideal for long-term ownership peace of mind.

Reliability and Longevity

With proper maintenance, the 2021 B-Class demonstrates excellent long-term durability. The M282 petrol and OM654q diesel engines are both capable of surpassing 250,000–300,000 km without significant mechanical issues. Mercedes’ high build standards ensure minimal wear in interior components and drivetrain assemblies over time.

Routine fluid replacements and software updates (for MBUX, transmission, and driver assistance systems) are crucial to maintaining performance and efficiency. The brand’s ServiceConnect system notifies authorized dealers automatically when maintenance is due, streamlining scheduling and reducing downtime.

Ownership Convenience and Customer Support

Mercedes-Benz enhances ownership through its Mercedes me connect digital ecosystem. This platform allows owners to remotely monitor vehicle health, check fuel levels, locate the car, and even book service appointments through a smartphone. Integration with MBUX voice control lets users inquire about maintenance status directly from the cabin, such as “Hey Mercedes, when is my next service due?”

Additionally, the 24-hour roadside assistance program provides complimentary towing, on-site repair for minor issues, and alternative transport services in case of breakdowns, underscoring Mercedes’ commitment to customer confidence and convenience.

Resale Value and Long-Term Costs

The 2021 B-Class retains an impressive 60–70% of its original value after three years, outperforming many mainstream competitors. This strong residual value is driven by Mercedes’ reputation for durability, brand prestige, and demand for compact premium models in the used market.

Ownership Metric	Rating	Commentary
Maintenance Cost Efficiency	4.6 / 5	Affordable and predictable
Reliability Score	4.7 / 5	Proven long-term dependability
Resale Value Retention	4.5 / 5	High demand in used market
Ownership Convenience	4.8 / 5	Seamless digital integration
Overall Satisfaction	4.7 / 5	Strong blend of comfort and practicality

Highlights

• ASSYST Plus system automates maintenance scheduling
• Low annual upkeep costs for a premium compact vehicle
• Engines engineered for 300,000+ km longevity
• Mercedes me connect simplifies service and monitoring
• High resale value and excellent long-term reliability

In summary, the 2021 Mercedes-Benz B-Class offers a balanced ownership experience that prioritizes reliability, ease of maintenance, and lasting value. Backed by Mercedes’ robust service infrastructure and intelligent care systems, it stands as one of the most practical and rewarding luxury compacts for long-term ownership.

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Frequently Asked Questions About the 2021 Mercedes-Benz B-Class

What engine options are available in the 2021 Mercedes-Benz B-Class?

The 2021 B-Class offers a wide range of engines, including turbocharged petrol units (B180, B200, B250) and diesel options (B200d, B220d). Petrol variants use a 1.3L or 2.0L turbo engine, while diesels feature the efficient OM654q 2.0L with advanced emission control systems meeting Euro 6d standards.

Does the 2021 B-Class come with all-wheel drive?

Yes. The B250 and B220d variants can be equipped with 4MATIC all-wheel drive, which distributes torque automatically between the front and rear axles. This system enhances stability, grip, and traction on wet or uneven surfaces, offering confident handling in all weather conditions.

How fuel-efficient is the 2021 Mercedes-Benz B-Class?

Fuel economy varies depending on the engine. Petrol models average between 5.7–6.5 L/100 km, while diesel versions are more efficient at 4.4–4.6 L/100 km (combined WLTP). The start/stop system and aerodynamic body design further reduce fuel consumption.

What is the cargo capacity of the 2021 B-Class?

The B-Class provides 455 liters of luggage space with the rear seats upright and up to 1,540 liters when folded. Its low load floor and hands-free power tailgate make it exceptionally convenient for families and everyday usability.

Is the 2021 B-Class reliable?

Yes. The 2021 B-Class has proven to be one of the most reliable compact Mercedes models. Both petrol and diesel engines are well-tested, and common issues are generally limited to minor software updates for the infotainment or transmission systems.

What safety features come standard?

Every 2021 B-Class includes the Mercedes-Benz Intelligent Drive suite, featuring Active Brake Assist, Attention Assist, Lane Keeping Assist, and Blind Spot Monitoring. Higher trims add Adaptive Cruise Control (DISTRONIC) and PRE-SAFE®, which prepares the cabin for impact in the event of an imminent collision.

Does the 2021 B-Class include MBUX infotainment?

Yes. The MBUX (Mercedes-Benz User Experience) system is standard across all trims. It includes voice control (“Hey Mercedes”), Apple CarPlay, Android Auto, and dual high-resolution displays (up to 10.25 inches). It can also learn user habits over time for a personalized experience.

How often does the B-Class need servicing?

The ASSYST Plus system determines maintenance intervals based on driving style and mileage, but on average, service is required every 15,000 km or once per year. Routine tasks include oil and filter changes, fluid checks, and software updates.

What is the warranty coverage for the 2021 B-Class?

Mercedes-Benz provides a 3-year / 100,000 km standard warranty, extendable up to 5 years / 160,000 km through ExtendedCare. This covers powertrain, electronics, and major mechanical components. Roadside assistance is included throughout the warranty period.

Is the 2021 Mercedes-Benz B-Class worth buying?

Absolutely. The 2021 B-Class blends practicality, efficiency, and Mercedes-level refinement into a compact, family-oriented package. It’s ideal for drivers seeking luxury and advanced technology in a vehicle that’s easy to maneuver, reliable to own, and versatile enough for everyday life.