2.0 CDI (OM640)
2005–2011 · diesel · 1991cc · 140hp
Engine codes: OM640
Reliability, common problems and owner reviews for the Mercedes Benz B-Class 2.0 CDI (OM640). Check this before you buy used.
The OM640 2.0 CDI — the same economical, reasonably reliable diesel as the A-Class W169, well-matched to the B-Class. The emissions hardware is the watch point: DPF lights on short-trip cars, plus injector and EGR wear with age. Strong with motorway use and disciplined servicing.
Same engine, other cars
This is the same physical engine (OM640) sold under different names across brands. Reliability is broadly shared — cross-check these:
Known Issues
DPF warning/clogging on mainly short stop-start trips.
Fix / Workaround: Regular motorway runs; clean/replace.
Repair cost: €200–€1000
Typically appears after: 120,000 km
Injectors and EGR wear with age.
Fix / Workaround: Service injectors; clean EGR.
Repair cost: €200–€900
Mileage Thresholds
After 200,000 km: DPF/injector attention.
Pre-Purchase Checklist
- ☐DPF history; prefer motorway use
- ☐Scan injector/EGR codes
- ☐Economical with care
Frequently asked questions
Is the Mercedes Benz B-Class 2.0 CDI (OM640) reliable?
Maint. Sensitive — The OM640 2.0 CDI — the same economical, reasonably reliable diesel as the A-Class W169, well-matched to the B-Class. The emissions hardware is the watch point: DPF lights on short-trip cars, plus injector and EGR wear with age. Strong with motorway use and disciplined servicing.
What are the common problems and reviews for the Mercedes Benz B-Class 2.0 CDI (OM640)?
The most commonly reported problems: DPF clogging (short trips), Injector / EGR wear.
Is a used Mercedes Benz B-Class 2.0 CDI (OM640) worth buying?
Fine if serviced correctly — but it punishes neglect hard. History and the right consumables matter.