Question 1

Air suspension faults and sagging (C-Class W205)

Accepted Answer

The air suspension can lose pressure from leaking air springs, a worn compressor or a faulty valve block, leaving the car low on one corner after being parked and showing a suspension fault message.

Question 2

Broken coil springs (C-Class W205)

Accepted Answer

Coil springs on the C-Class W205 are known to snap, usually at the bottom coil, after years of corrosion. Symptoms are a clunk over bumps, the car sitting lower on one corner and, often, an MOT failure. Broken springs can puncture a tyre.

Question 3

AdBlue (SCR) system faults (C 220 d)

Accepted Answer

The SCR emissions system on the C 220 d can develop faults in the AdBlue pump, tank heater, NOx sensors or dosing injector, often caused by crystallised fluid. The dashboard shows an emissions warning and a countdown in miles after which the engine will not restart.

Mercedes-Benz C-ClassC-Class W205

Known issues and common problems

Mercedes-Benz C-ClassC-Class W205

Known issues and common problems

Air suspension faults and sagging (C-Class W205)at 130000 km · 1 solutionsMedium

Broken coil springs (C-Class W205)at 120000 km · 1 solutionsMedium

AdBlue (SCR) system faults (C 220 d)1 solutionsHigh