REDLINE ALLEYMercedes Benz C-Class W205 buying guide
2014 to 2021. A W205 suits a buyer who wants a refined, modern Mercedes and is ready for the running costs that come with it.
Big jobs
- Diesel emissions parts. The diesel particulate filter, NOx sensors and AdBlue system are problem areas, and the diesels do not take well to short trips.
- Air suspension and front control arms. Air suspension, often fitted, is costly to fix, and the lower front control arms wear.
- Power steering. There are numerous reported power steering issues and several recalls.
Workshop jobs
- Cooling system and thermostat. Plastic cooling parts can fail with age, and thermostats are prone to failure on some engines; the part is cheap but the labour is not.
- C200 fuel smell. A petrol smell on the C200 is probably a fuel line at the fuel pump, and it is worse when cold.
- Crankcase ventilation and intake parts. Crankcase ventilation valves are a weak point, usually flagged by a dash warning, plastic air inlets can crack and cam position sensors can go out of adjustment.
- Electronics and interior. Electronic glitches feature in owner reports, the touchpad and centre console switches are weak points, and seat covers can split and the headlining sag.
Small jobs
- Brakes. Squealing brakes and premature pad wear are commonly reported.
Questions for the seller
- Which engine is it, and is it petrol or diesel?
- Does it have air suspension?
- Have all recalls been done, including the steering recalls?
- Has the thermostat been replaced?
- Is there a complete Mercedes service history?
Sources
Researched 2026-11-04. General guidance from owner and specialist sources. Check the specific car with an independent inspection.