Mercedes-Benz C-Class W203 — Reliability

W203 2001–2005 1 engine

Reliability Summary

Engine M112/M113 — 92/100 BEST
Known Issues 3

Engine in this model

BEST 92

M112/M113

V6/V8 NA

Last simple MB V6/V8. Over-engineered. Cheap to maintain. 250k+ km.

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Known Issues Across All Engines

Issue Engine Severity Onset
Air suspension / Airmatic failure (S/ML models) M112/M113 moderate 100,000 km – 180,000 km
Spark plugs + ignition coils (V6/V8) M112/M113 minor 80,000 km – 150,000 km
Coolant system: thermostat + expansion tank M112/M113 minor 100,000 km – 180,000 km