Mercedes-Benz C-Class W205 — Reliability
Reliability Summary
Engine
OM651 (late) — 72/100
ACCEPTABLE
Known Issues
7
Engine in this model
Known Issues Across All Engines
| Issue | Engine | Severity |
|---|---|---|
| Timing chain and tensioner wear (rear-mounted simplex chain) | OM651 (late) | high |
| Chain tensioner seal ring leaks oil — recall for Feb-Nov 2014 build | OM651 (late) | high |
| Piezo injector failure — 204 PS (250 CDI / 250 d) variant | OM651 (late) | high |
| DPF blockage — city driving concern | OM651 (late) | high |
| Coolant loss — cylinder-head coolant connector and water pump | OM651 (late) | moderate |
| AdBlue / SCR faults: NOx sensors, crystallised dosing nozzle | OM651 (late) | moderate |
| EGR valve fouling | OM651 (late) | moderate |