A180d / A200d / A220d (OM654q 2.0)
2018–2024 · diesel · 1950cc · 150hp
Engine codes: OM654, OM654q
Reliability, common problems and owner reviews for the Mercedes Benz A-Class W177 A180d / A200d / A220d (OM654q 2.0). Check this before you buy used.
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.
Same engine, other cars
This is the same physical engine (OM654) sold under different names across brands. Reliability is broadly shared — cross-check these:
Known Issues
DPF clogs and EGR soots on short trips; AdBlue/SCR system.
Fix / Workaround: Motorway regens; clean EGR; diagnose SCR.
Repair cost: €300–€1300
Typically appears after: 140,000 km
Injector attention at higher mileage; dual-clutch fluid.
Fix / Workaround: Injector test; DCT fluid service.
Repair cost: €200–€1400
Typically appears after: 170,000 km
Mileage Thresholds
After 220,000 km: OM654 high-mileage capable.
Pre-Purchase Checklist
- ☐220d is the pick
- ☐OM654 improved over OM651
- ☐Oil + DPF + AdBlue history
Frequently asked questions
Is the Mercedes Benz A-Class W177 A180d / A200d / A220d (OM654q 2.0) reliable?
Maint. Sensitive — 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.
What are the common problems and reviews for the Mercedes Benz A-Class W177 A180d / A200d / A220d (OM654q 2.0)?
The most commonly reported problems: DPF / EGR / AdBlue, Injector / DCT (high miles).
Is a used Mercedes Benz A-Class W177 A180d / A200d / A220d (OM654q 2.0) worth buying?
Fine if serviced correctly — but it punishes neglect hard. History and the right consumables matter.