A-Class W177
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Which Mercedes Benz A-Class W177 engine is the most reliable? See common problems, reviews and reliability verdicts across generations and engines.
Frequently asked questions
Which Mercedes Benz A-Class W177 engine is the most reliable?
A180d / A200d / A220d (OM654q 2.0) — Maint. Sensitive verdict. The A-Class diesels use the modern 2.0 OM654 (in its compact 'q' form — shared with the GLB/GLC and C/E-Class) — a refined, strong and genuinely economical unit and the engine to buy if you do the miles. It's a much-improved design over the older OM651 (no rear-chain-rattle reputation), with the standard modern-diesel cautions: DPF on short trips, EGR, AdBlue/SCR, and injector attention at high miles. Paired with the 8G/7G-DCT. A motorway-driven, serviced car is a dependable long-hauler — the 220d is the pick. Buy on oil, DPF and AdBlue history.
Which Mercedes Benz A-Class W177 engines should you avoid?
None of the Mercedes Benz A-Class W177 engines listed are rated "Problematic" or "Avoid" — but always check the service history before buying.
What are the most common Mercedes Benz A-Class W177 problems?
The most commonly reported problems across all Mercedes Benz A-Class W177 generations and engines: DPF / EGR / AdBlue, Injector / DCT (high miles), Intake carbon / turbo / PCV, 7G-DCT dual-clutch, 7G-DCT / bore coating.