What to watch out for
Complaint of noisy electric folding mirrors.
Serious issues with piezo injectors of 220 CDIs cracking in later 2009. Many cars off the road for extended periods. Supply problems of replacement injectors, apparently made in Malaysia.
Seems to be a widespread problem with automatic transmissions. MB is instructing dealers to replace the transmission valve control body, but there is a shortage of parts.
Battery drains over about 2 weeks seems to be a problem.
Problem of premature wear of timing chain sprocket for balancer shaft of M272 and M273 V6 petrol engines. Mercedes Star bulletin about this. Big job. Can cost £4,000.
Several reports of brown stains appearing on alloy wheels of C-Class at 2 - 3 years old.
Paint problem after 4 years on front and rear bumpers of solid red painted examples.
C350 has propensity to blow 477 H7 dipped beam bulbs.
Uresolved dashboard rattle irritating some owners. Apparently MB is aware and is developing a kit to fix it?
Report of MoT Advisory for rusting brake pipes on 45k mile November 2007/57 C220 CDI.
Plastic interior door handles of W204 and S204 C Class seem to be breaking regularly. The first to fail is the drivers because it is the most used. Because these are an integral part of the door panel and not available separately, the cost to replace is £374 (inc VAT), plus fitting. Up to 75% is offered in 'Goodwill' in Germany. Nothing so far in the UK.
Plastic interior door handles of W204 C Class seem to be breaking regularly. The first to fail is the drivers because it is the most used. Because these are an integral part of the door panel and not available separately, the cost to replace is £374 (inc VAT), plus fitting. Up to 75% is offered in 'Goodwill' in Germany. Nothing so far in the UK.
Glycol contamination of automatic transmission fluid via the transmission heat exchanger can still sometimes occur, necessitatiing a new radiator and heat exchanger and flushing out and changing of ATF.
Rusted brake pipes reported on 2007 Mercedes W204 C320, replaced at 45k miles, then at 66k miles paint on rear wheelarches flaked off and surface corrosion set in (see photo).
Another injector failure reported on 2011 S204 Mercedes C220 CDI Blue Efficiency.
Oil pump failure reported on 126k mile 2007 Mercedes C220 CDI.
jerks from 7G automatic transmission in C-Class less than 3 years old were not cured by a dealer software update. An automatic transmission fluid change did cure the problem, but the dealer tried to charge for it.