C-Class W204
1 generation · Select a generation to see engines
Which Mercedes Benz C-Class W204 engine is the most reliable? See common problems, reviews and reliability verdicts across generations and engines.
Frequently asked questions
Which Mercedes Benz C-Class W204 engine is the most reliable?
C200 / C220 CDI 2.1 (OM646, to 2009) — Reliable verdict. The older 2.1 CDI — noisy but close to invincible. Simpler than the OM651 that replaced it, with fewer emissions complications. The choice for high-mileage drivers who want a durable W204 diesel.
Which Mercedes Benz C-Class W204 engines should you avoid?
Engines with the weakest reliability verdicts: C180 / C200 / C250 CGI 1.8 (M271).
What are the most common Mercedes Benz C-Class W204 problems?
The most commonly reported problems across all Mercedes Benz C-Class W204 generations and engines: Piezo injector failure (early cars), Timing chain stretch / cam phaser wear, Cylinder head bolt corrosion/failure, Intake camshaft & lifter wear, Balance shaft gear wear (early serials).