Mercedes-Benz C-Class W203 — Reliability

W203 2002–2005 1 engine

Reliability Summary

Engine OM648 — 90/100 BEST
Known Issues 2

Engine in this model

BEST 90

OM648

3.2L CDI Diesel I6

Modern OM606 successor. Excellent highway cruiser. Strong torque.

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Known Issues Across All Engines

Issue Engine Severity Onset
EGR valve fouling (city use) OM648 moderate 80,000 km – 160,000 km
Glow plugs + injector seals OM648 minor 80,000 km – 160,000 km