Mercedes Benz C-Class W204 buying guide

2007 to 2014. A W204 suits a buyer who wants a comfortable, solid sedan or wagon and is ready for Mercedes repair costs.

Big jobs

Six cylinder petrol timing chain stretch. Six cylinder petrol engines were prone to premature timing chain stretch, and low km does not rule it out.
Diesel injectors and main bearings. Early injector problems were supposedly fixed, but the oldest cars may need injector work again. A ticking at idle on the larger diesels can mean main bearing damage.
7G-Tronic automatic. Harsh or jerky gear changes, mainly on post facelift cars, can point to a valve body problem that costs thousands to fix.
Electronic key and steering column lock. The steering column lock may not release and the key may not be recognised, which is a common and expensive repair.

Power steering leaks. Power steering leaks are most common on pre facelift cars.
Headlamp moisture and electrics. Moisture gets into the xenon headlights and the indicator control module, and rear lamps suffer earth faults.
Rear subframe and boot corrosion. The rear subframe is prone to corrosion, and oxidation round the boot becomes more common with age.
Engine mounts and control arm bushes. Failing engine or gearbox mounts cause harshness, and worn control arm bushes knock or clunk when pulling away.

Researched 2026-11-04. General guidance from owner and specialist sources. Check the specific car with an independent inspection.