Question 1

What is OM651 Diesel Chain Tensioner Oil Leak on the Mercedes-Benz Mercedes-Benz C-Class (W204)?

Accepted Answer

The gasket on the timing chain tensioner can fail, leaking oil and potentially leading to timing chain issues due to inconsistent tension.

Question 2

What is Rear Subframe Corrosion on the Mercedes-Benz Mercedes-Benz C-Class (W204)?

Accepted Answer

The rear subframe rots from the inside out, leading to MOT failure. Mercedes often replaces these under goodwill.

Question 3

What is Electronic Steering Lock (ESL) failure on the Mercedes-Benz Mercedes-Benz C-Class (W204)?

Accepted Answer

The 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.

Question 4

What should I check when buying a used Mercedes-Benz Mercedes-Benz C-Class (W204)?

Accepted Answer

Inspect the rear subframe very carefully; ask about Mercedes goodwill replacement.

Question 5

What should I check when buying a used Mercedes-Benz Mercedes-Benz C-Class (W204)?

Accepted Answer

Listen for steering lock (ESL) failure signs.

Question 6

What should I check when buying a used Mercedes-Benz Mercedes-Benz C-Class (W204)?

Accepted Answer

M271 petrols need timing chain checks.

Question 7

What years was the Mercedes-Benz Mercedes-Benz C-Class (W204) made?

Accepted Answer

The Mercedes-Benz Mercedes-Benz C-Class (W204) was produced from 2007 to 2014.

Mercedes-Benz Mercedes-Benz C-Class (W204)

Mercedes-Benz C-Class (W204) Reliability & Common Faults

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