A180 / A200 / A220 CDI (OM607 / OM651)
2012–2018 · diesel · 2143cc · 136hp
Engine codes: OM607, OM651
Reliability, common problems and owner reviews for the Mercedes Benz A-Class W176 A180 / A200 / A220 CDI (OM607 / OM651). Check this before you buy used.
The A-Class diesels split between the smaller Renault-sourced 1.5 (OM607, the A180 CDI — frugal but modest, K9K-derived) and the Mercedes 2.1 (OM651, A200/A220 CDI — stronger). The OM607 carries the Renault diesel's injector/EGR/DPF cautions; the OM651 carries its known early-Delphi-injector risk and rear-chain wear. Both want clean oil and DPF attention on short trips. A documented, motorway-driven car is dependable; the OM651 is the better-matched engine if you want torque.
Same engine, other cars
This is the same physical engine (OM651) sold under different names across brands. Reliability is broadly shared — cross-check these:
- Mercedes-Benz GLA X156— GLA180d / 200d / 220d (OM651 / OM607)170hp
- Mercedes-Benz Vito / Viano— 2.1 CDI (OM646 / OM651)163hp
- Mercedes-Benz GLK— 220/250 CDI 2.1 (OM651)204hp
- Mercedes-Benz C-Class W204— C200 / C220 CDI 2.1 (OM646, to 2009)170hp
- Mercedes-Benz E-Class W211— E200 / E220 CDI 2.2 (OM646)170hp
- Mercedes-Benz B-Class— 1.8 / 2.1 CDI (OM651)136hp
- Mercedes-Benz C-Class W205— C200d / C220d / C250d (OM651 → OM654)194hp
- Mercedes-Benz M-Class (ML)— ML250 BlueTEC 2.1 CDI (OM651)204hp
- Mercedes-Benz CLA C117— CLA180d / 200d / 220d (OM651 / OM607)177hp
- Mercedes-Benz C-Class W204— C200 / C220 / C250 CDI 2.1 (OM651, 2009+)170hp
Known Issues
Early OM651 Delphi injectors can fail; rear-mounted chain can rattle (labour-heavy).
Fix / Workaround: Injector test; chain rattle check; revised parts.
Repair cost: €250–€1600
Typically appears after: 130,000 km
Renault-sourced OM607 has the usual injector/EGR/DPF cautions on short trips.
Fix / Workaround: Motorway regens; injector/EGR service.
Repair cost: €200–€1000
Typically appears after: 130,000 km
Mileage Thresholds
After 150,000 km: Injector + chain/DPF window.
Pre-Purchase Checklist
- ☐OM651: injector + chain history
- ☐OM607 is the smaller Renault-derived 1.5
- ☐DPF history (city cars)
Frequently asked questions
Is the Mercedes Benz A-Class W176 A180 / A200 / A220 CDI (OM607 / OM651) reliable?
Maint. Sensitive — The A-Class diesels split between the smaller Renault-sourced 1.5 (OM607, the A180 CDI — frugal but modest, K9K-derived) and the Mercedes 2.1 (OM651, A200/A220 CDI — stronger). The OM607 carries the Renault diesel's injector/EGR/DPF cautions; the OM651 carries its known early-Delphi-injector risk and rear-chain wear. Both want clean oil and DPF attention on short trips. A documented, motorway-driven car is dependable; the OM651 is the better-matched engine if you want torque.
What are the common problems and reviews for the Mercedes Benz A-Class W176 A180 / A200 / A220 CDI (OM607 / OM651)?
The most commonly reported problems: OM651 injector (early Delphi) / chain, DPF / EGR / injectors (OM607).
Is a used Mercedes Benz A-Class W176 A180 / A200 / A220 CDI (OM607 / OM651) worth buying?
Fine if serviced correctly — but it punishes neglect hard. History and the right consumables matter.