B-Class
2 generations · Select a generation to see engines
Which Mercedes Benz B-Class engine is the most reliable? See common problems, reviews and reliability verdicts across generations and engines.
Frequently asked questions
Which Mercedes Benz B-Class engine is the most reliable?
1.7 / 2.0 petrol (M266) (B-Class (W245)) — Maint. Sensitive verdict. The W245 shares the A-Class M266 petrols — simple, reliable engines, with the 2.0 (B200, incl. turbo) the better-matched choice for the taller, heavier B-Class body. Main niggles are ignition coils, plugs and the odd injector/sensor causing misfires and rough idle; prefer a 2008+ car with the early faults sorted. Note the 2.0 is 2,034cc (over 2.0L for tax in some countries). A dependable, low-drama people-carrier engine.
Which Mercedes Benz B-Class engines should you avoid?
None of the Mercedes Benz B-Class engines listed are rated "Problematic" or "Avoid" — but always check the service history before buying.
What are the most common Mercedes Benz B-Class problems?
The most commonly reported problems across all Mercedes Benz B-Class generations and engines: Coil / plug / injector faults, DPF clogging (short trips), Injector / EGR wear, Timing chain wear (early), Intake carbon (DI).