2014 MERCEDES-BENZ C-Class M274 DE20 LA/M276 DE30 LA (W205)
W205 / Sedan / Estate (market-dependent) / Global (Europe, North America, Asia-Pacific, others)
M274 DE20 LAM276 DE30 LAOM651OM654Exact year/trim recordSilver
Engine identity
Oils and fluids
Service and parts data
Common and chronic problems
- Timing chain wear on some M274 engines
- Water pump issues in diesel OM651 engines
- Balance shaft bearing wear in some 1.6L M274 engines
First checks
- Check timing chain condition and service history
- Inspect coolant system for leaks
- Verify transmission fluid level and service status
Before replacing parts
- Save fault codes and freeze-frame data before clearing anything.
- Check engine oil, coolant and transmission fluid using the correct temperature and service procedure.
- Verify power, ground, connectors, hoses, leaks and live data before replacing expensive parts.
Important notes
- The 2014 W205 C-Class launched in Europe in early 2014; USA introduction started as 2015 model year.
- Availability of engines and transmissions varies strongly by market and emission regulations.