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W203 Sedan · Estate · Coupe
Mercedes-Benz C-Class · Sedan · Estate · Coupe · 2000–2007
Kompressor fours and the supercharged C32 AMG.
Production run
2000–2007
Engines covered
6
Avg. part price
—
19902026
Interactive systems map
Inspect the W203
Tap a hotspot to inspect that system
Systems map
Where it goes wrong
Each numbered hotspot counts the documented failure points in that area. Select one to see the specifics for this chassis and engine.
Failure points by system
Engine3
Cooling1
Intake4
Fuel1
Electrical1
Transmission2
Documented issues per engine
4M111
4M271
4M112
4M113
4OM611
5OM642
Known weak points
What breaks on the W203
Head gasketDiagnose →Supercharger clutchDiagnose →Timing chain and tensioner (well-known)Diagnose →Balance shaft gear wear (2003–2008)Diagnose →Head bolt / gasket leaksDiagnose →Intake manifold flapDiagnose →Camshaft adjuster magnetsDiagnose →Motor mountsDiagnose →Injector sealsDiagnose →Turbo actuatorDiagnose →Oil cooler seal leak (classic)Diagnose →Swirl flap / intake runner failureDiagnose →
Guides & playbooks
W203 playbooks
Maintenance scheduleGive me a mileage-based maintenance schedule for a Mercedes-Benz C-Class W203, including the items the factory schedule skips.Buyer's inspectionI'm inspecting a used Mercedes-Benz C-Class W203. What exactly should I check, test drive and look for underneath?Build planPlan a staged performance build for a Mercedes-Benz C-Class W203 that stays reliable as a daily driver.Fault code lookupI have a fault code on my Mercedes-Benz C-Class W203. Walk me through what it means and how to confirm the cause.
Fits your W203
Parts & tools
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