Mercedes B-Class Problems: What To Know Before Buying

May 5, 2025May 5, 2025 @CarExamer 1 Views 0 Comments

The Mercedes-Benz B-Class is a compact MPV (multi-purpose vehicle) that offers more space and practicality than the smaller A-Class, while still delivering the premium feel expected from the brand. Known for comfort, efficiency, and family-friendly features, the B-Class has become a popular choice for urban and suburban drivers alike. However, like any vehicle, the B-Class isn’t without its flaws. If you’re considering buying one — especially a used model — it’s important to understand the most common Mercedes B-Class problems, particularly in the W245 (2005–2011), W246 (2011–2018), and W247 (2019–present) generations.

Book inspection

1. CVT and Dual-Clutch Transmission Issues

Earlier B-Class models (W245) use a CVT (Continuously Variable Transmission) that has been known to fail prematurely if not maintained. Later models (W246, W247) switched to dual-clutch gearboxes, which also have common complaints.

Problems include:

Jerky shifting
Hesitation when accelerating
Difficulty selecting reverse gear
Transmission warning lights

Regular gearbox servicing and software updates can prevent costly repairs, but high-mileage vehicles should be checked carefully.

2. Turbo and Engine Performance Issues

Turbocharged petrol and diesel engines offer good performance, but some owners have reported issues such as:

Loss of power under acceleration
Turbo failure or lag
Oil leaks around the valve cover or turbo system
Rough idling or engine misfires

Most of these problems stem from clogged EGR valves, carbon build-up, or worn components. Routine oil changes and intake cleaning help reduce risk.

3. Electrical Faults and Dashboard Warnings

Mercedes vehicles often include advanced electronics, and the B-Class is no exception.

Typical electrical faults include:

Sensor failures (ABS, airbag, TPMS)
Faulty parking sensors
Malfunctioning infotainment or navigation systems
Battery drain or power loss

Software updates and diagnostic scans can help fix these problems before they lead to full system failures.

4. Suspension and Steering Wear

Many B-Class owners report issues with suspension noise or premature wear, especially in older or city-driven models.

Common signs:

Clunking noises over bumps
Loose steering feel
Uneven tyre wear

Worn-out bushes, struts, and ball joints are typically to blame. These issues affect ride quality and should be addressed promptly.

5. Interior Trim and Build Quality (W245 and W246)

While the B-Class cabin is generally solid, early models (especially pre-2015) can suffer from:

Squeaky dashboard components
Fading or peeling button coatings
Door lock actuator failures

Later W247 models have improved materials and better fit and finish.

6. Air Conditioning and HVAC System Issues

Some owners have noted problems with the air conditioning system, including:

Weak airflow or non-functioning AC
Heater blower failure
Clicking noises from behind the dash

Often these issues are caused by a faulty blower motor or actuator, both of which can be replaced if caught early.

Final Thoughts: Is the Mercedes B-Class Reliable?

Overall, the Mercedes B-Class is a practical and comfortable compact family car. Later generations (W246 and W247) offer improved technology and reliability over the first generation. If you’re shopping for one: