Mercedes-Benz C-Class W204 — Reliability

W204 2010–2014 1 engine

Reliability Summary

Engine OM651 (early) — 66/100 CAUTION
Known Issues 4

Engine in this model

CAUTION 66

OM651 (early)

2.1L Diesel I4

The 2008-2014 OM651. The 220 CDI (to 2010/11) and 250 CDI had failure-prone piezo injectors, the 200...

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Known Issues Across All Engines

Issue Engine Severity Onset
Timing chain stretch and tensioner wear (rear-mounted chain) OM651 (early) critical 150,000 km
DPF + EGR fouling (city use) OM651 (early) high 60,000 km – 120,000 km
Piezo injector failure — 220 CDI (to 2010/11) and 250 CDI OM651 (early) high 50,000 km
Water pump leak (March-July 2009 build) and cylinder-head coolant stub OM651 (early) moderate —