KNOWN FAULTS · Mercedes-Benz

Mercedes-Benz Clase B (W246) B 180 / 200 (M270) common problems.

2011–2018 · Petrol

Sources are not verified in real time and no entry confirms that your car is affected.

1 known fault with sources

M270/M274 chain, adjusters and thermostatTiming / leaks

Engine / equipment: M270 and M274 1.6/2.0 turbo petrol (A, B, CLA, GLA, C, E, GLC, SLC)
Period mentioned: 2012–2020
Symptoms: Chain rattle on cold starts; engine light with camshaft timing codes (for example P0016 or P001685); oil leaks at the camshaft adjusters; slow coolant loss.
Possible cause described: The hydraulic tensioner loses pressure overnight and the plastic guides wear, especially with long oil change intervals. The camshaft adjuster magnets leak oil (common between 65,000 and 110,000 km) and the plastic thermostat housing cracks.
Check for the garage: Listen to a cold start, read camshaft codes, look for oil on the adjuster magnets and coolant residue at the thermostat. Use Mercedes 229.5 oil.
Cost cited in the source: Chain and tensioner: approx. €320–1,650 (converted from dollars)A rough figure from the original database, not an up-to-date quote.

Mileage cited in the database: 65,000–110,000 km. This is not a maintenance interval and does not predict a failure.