2014–2018 Mercedes-Benz C-Class (W205)
Browse our directory of 2014–2018 Mercedes-Benz C-Class (W205) vehicles. Access instant MOT history reports, tax status, and reliability insights for any registration listed below.
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Common Problems & Reliability
The 2014–2018 Mercedes-Benz C-Class (W205) has 3 known issues. 1 of these are classified as serious faults that could be expensive to repair. 2 are moderate concerns worth inspecting before purchase.
Airmatic air suspension leaks
SeriousCars equipped with Airmatic can develop leaking air springs or a failing compressor, causing the car to sag overnight. Ignoring it burns out the compressor, pushing bills toward £2,000+.
Symptoms: Car sits low after standing overnight, Suspension malfunction warning...
Est. repair cost: £800–£2,000
OM651 Diesel Chain Tensioner Oil Leak
ModerateThe timing chain tensioner gasket can leak oil. If left unaddressed, the loss of tensioner pressure can cause timing chain rattle and eventual stretch.
Symptoms: Oil leaking from the right side of the engine, Burning oil smell...
Est. repair cost: £200–£500
NOx sensor and AdBlue system faults
ModerateCommon on OM651 and OM654 diesels. Water ingress or soot can kill the sensors. Often requires replacing both upstream and downstream sensors simultaneously.
Symptoms: Engine management light, AdBlue countdown...
Est. repair cost: £600–£1,500
Buying Tips for the 2014–2018 Mercedes-Benz C-Class (W205)
- ✓Scan for NOx and AdBlue faults on diesels; Mercedes often requires both sensors to be replaced as a pair.
- ✓Check Airmatic cars for sinking after an overnight stand.
- ✓Look for screen delamination on earlier models.
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