2013 MERCEDES-BENZ C-Class M271 DE18 LA (1.8L I4 turbo, Europe/Asia)/M274 DE20 LA (2.0L I4 turbo, North America, Europe) (W204)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Timing chain stretch on early M271 engines
• Water pump and thermostat failures on some engines
• Diesel particulate filter (DPF) clogging on diesel variants

First checks

• Verify engine code and timing chain service history
• Check for coolant leaks and thermostat function
• Inspect DPF regeneration history on diesel versions

Vor dem Teiletausch

• 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

• Market-specific engine options and emissions equipment applied; North American petrol engines differ from European versions
• 2013 was the final production year of W204 before the 2014 W205 generation launch