2009–2012 Mercedes-Benz C-Class (W204)
Browse our directory of 2009–2012 Mercedes-Benz C-Class (W204) vehicles. Access instant MOT history reports, tax status, and reliability insights for any registration listed below.
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Common Problems & Reliability
The 2009–2012 Mercedes-Benz C-Class (W204) has 3 known issues. 2 of these are classified as serious faults that could be expensive to repair. 1 are moderate concerns worth inspecting before purchase.
Rear Subframe Corrosion
SeriousThe rear subframe rots from the inside out, leading to MOT failure. Mercedes often replaces these under goodwill.
Symptoms: Heavy corrosion noted by MOT, Rust on suspension mounts
Est. repair cost: £0 (Goodwill) – £1,500
Electronic Steering Lock (ESL) failure
SeriousThe electronic steering lock module can fail, preventing the car from starting. The key is recognised but the steering remains locked. A common and expensive fault on W204s built before the facelift.
Symptoms: Key recognised but engine won't crank, Steering lock warning on dash...
Est. repair cost: £400–£1,200
OM651 Diesel Chain Tensioner Oil Leak
ModerateThe gasket on the timing chain tensioner can fail, leaking oil and potentially leading to timing chain issues due to inconsistent tension.
Symptoms: Oil leaking onto the right side of the engine block, Rattle on cold start
Est. repair cost: £200–£450
Buying Tips for the 2009–2012 Mercedes-Benz C-Class (W204)
- ✓Inspect the rear subframe very carefully; ask about Mercedes goodwill replacement.
- ✓Listen for steering lock (ESL) failure signs.
- ✓M271 petrols need timing chain checks.
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