Home / Makes / Mercedes-Benz / C-Class Known Faults Database Mercedes-Benz C-Class Common Problems & Known Faults (UK) If you are considering buying a used Mercedes-Benz C-Class, there are several major reliability issues worth knowing about first. Our garage database tracks 5 known faults for this model, 4 of them rated high severity. Every one below is a repair bill a seller has good reason not to mention.
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Mercedes-Benz C-Class W204 (2009-2012) problems Fuel System High severity 📝 Editorial
Piezo Delphi fuel injector failure leading to limp mode and severe misfires Typical symptoms engine management light sudden limp mode severe juddering and misfire Affected vehicles
Engines: 2.1 CDI (OM651)
Typical mileage: 40000-80000 miles Mercedes-Benz C-Class 2005-2014 Models (2005-2014) problems Engine/Emissions High severity 📝 Editorial
Oil cooler seals fail in the 'V' of the engine causing massive oil leaks Typical symptoms oil pooling in the engine valley oil leaking down the back of the engine onto the undertray burning oil smell in the cabin Affected vehicles
Engines: 3.0 V6 CDI (OM642)
Typical mileage: 60000-100000 miles Mercedes-Benz C-Class 2004-2008 Models (2004-2008) problems Engine/Emissions High severity 📝 Editorial
Soft metal on the balance shaft timing gear wears completely away, destroying engine timing Typical symptoms Engine Management Light (EML) on fault codes P0016 / P0017 (camshaft timing) rough running or misfiring Affected vehicles
Engines: 3.5 V6 Petrol (M272) / 5.5 V8 (M273)
Typical mileage: 60000-90000 miles Mercedes-Benz C-Class W203 / W204 / W211 (2002-2013) problems Engine/Emissions High severity 📝 Editorial
Single-row timing chain stretches and jumps teeth, destroying the valves Typical symptoms loud metallic rattle on startup for 3-5 seconds engine management light loss of compression and non-start Affected vehicles
Engines: 1.8 Kompressor / CGI Petrol (M271)
Typical mileage: 60000-90000 miles Mercedes-Benz C-Class W205 / X253 (2014-2019) problems Steering Low severity 📝 Editorial
Severe 'crabbing' or skipping of the front tires on full steering lock in cold weather Typical symptoms loud clunking from front wheels on full lock (parking) front end feeling like it is skipping across the road surface rapid uneven front tire wear Affected vehicles
Engines: All (particularly AMG Line and 4Matic)
Typical mileage: 0-50000 miles Repair costs are typical UK ranges, not quotes. Actual cost depends on condition and garage. Data last verified: June 2026
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