Credov's researched list of the 4 faults the Mercedes-Benz C63 W204 is known for (2008–2014), 4 of them serious or costly. Each one says what to look for when you check the car, so you can spot it before you buy. Not every car has these faults: they are the ones worth checking on this model.
What to look for: Lying beside the car, follow the rear brake lines for flaking, swollen or crusty metal, or wet fluid.
Why it matters: A burst rear brake line gives a sudden long, soft pedal and reduced braking, and often appears together with rear subframe rust on the same cars.
What to look for: On a cold start listen for misfire or rough running, and look in the coolant tank for oily scum or bubbles.
Why it matters: A snapped head bolt can end in coolant loss, overheating, a hydro-locked cylinder or a ruined engine, and the fix on many cars means taking the cylinder heads off.
What to look for: On a cold start, listen for a 2-10 second rattle or clatter from the front of the engine.
Why it matters: Left alone, the slipping timing leads to rough running and cam-timing fault codes, and UK specialists list new adjusters and plates among the first preventive jobs on a used example.
What to look for: Look at the inner rim of each wheel with a torch, front wheels turned fully, for cracks or weld marks.
Why it matters: A cracked wheel can lose air quickly or fail outright on a hard hit, and new factory wheels are expensive to replace.
Got a question about a Mercedes-Benz C63 W204? Ask Credov: a noise, a warning light, a part or how to fix it.
On top of the faults above, every Credov inspection covers the basics: fuel smell, leaks or filler rust, engine oil leaks, power steering fluid leak, drive belt cracks or squeal, rust underneath: chassis and mounts, engine mounts, engine oil level and colour, coolant level, colour and leaks, head gasket failure signs, cold start: rattle, knock or smoke, rough or hunting idle, engine running hot on gauge, gearbox or diff oil leak, swapped gearbox without lvv and more.
Researched by Credov from manufacturer recalls and service bulletins, owner reports and workshop sources. Repair prices are typical ranges, not quotes. See also fault codes and repair costs.