2014 MERCEDES-BENZ S-Class M278 DE46 LA/M157 DE55 LA (W222)
W222 / Sedan / Global (primarily Europe, North America, China, Middle East)
M278 DE46 LAM157 DE55 LAOM642OM651Exact year/trim recordGold
Engine identity
Oils and fluids
Service and parts data
Common and chronic problems
- Air suspension leaks
- Electronic module failures
- Timing chain stretch on early M278 engines
First checks
- Verify air suspension condition
- Check electronic modules and software updates
- Inspect timing chain and tensioners
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
- Engine and features vary significantly by global market and model variant; diesel engines are more common in Europe, gasoline V8 and AMG variants more prominent in North America and Middle East.
- Oil capacity and service fill volumes can differ slightly depending on engine choice and oil filter variant.