C220d / C300d (OM654M 2.0)
2021–2024 · diesel · 1993cc · 200hp
Engine codes: OM654M, OM654
Reliability, common problems and owner reviews for the Mercedes Benz C-Class W206 C220d / C300d (OM654M 2.0). Check this before you buy used.
The W206 diesels use the latest 2.0 OM654M with 48V ISG mild-hybrid (C220d/C300d — an evolution of the excellent OM654 shared with the E-Class/GLC). The OM654 family is one of the best modern diesels: refined, very economical and durable, having long since banished the OM651's rear-chain and Delphi-injector reputation. Standard modern-diesel cautions: DPF on short trips, EGR, AdBlue/SCR, injector attention at high miles, plus the 48V ISG system. Paired with the 9G-Tronic. A motorway-driven, serviced car is a dependable executive long-hauler — the C220d is the high-mileage 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
48V ISG system; injector attention at higher mileage.
Fix / Workaround: Diagnose ISG; injector test.
Repair cost: €200–€1500
Typically appears after: 170,000 km
Mileage Thresholds
After 250,000 km: OM654 family is high-mileage capable.
Pre-Purchase Checklist
- ☐C220d is the high-mileage pick
- ☐OM654 family is excellent
- ☐Oil + DPF + AdBlue history
Frequently asked questions
Is the Mercedes Benz C-Class W206 C220d / C300d (OM654M 2.0) reliable?
Maint. Sensitive — The W206 diesels use the latest 2.0 OM654M with 48V ISG mild-hybrid (C220d/C300d — an evolution of the excellent OM654 shared with the E-Class/GLC). The OM654 family is one of the best modern diesels: refined, very economical and durable, having long since banished the OM651's rear-chain and Delphi-injector reputation. Standard modern-diesel cautions: DPF on short trips, EGR, AdBlue/SCR, injector attention at high miles, plus the 48V ISG system. Paired with the 9G-Tronic. A motorway-driven, serviced car is a dependable executive long-hauler — the C220d is the high-mileage pick. Buy on oil, DPF and AdBlue history.
What are the common problems and reviews for the Mercedes Benz C-Class W206 C220d / C300d (OM654M 2.0)?
The most commonly reported problems: DPF / EGR / AdBlue, 48V ISG / injector.
Is a used Mercedes Benz C-Class W206 C220d / C300d (OM654M 2.0) worth buying?
Fine if serviced correctly — but it punishes neglect hard. History and the right consumables matter.