2005 MERCEDES-BENZ C-Class M271 DE18 LA/M272 E25 (W203)
W203 / Sedan / Wagon / Coupe (varies by market) / Global markets including Europe, North America, and Asia
M271 DE18 LAM272 E25OM611 DE22 LAOM646 DE22 LAFiche exacte année/versionGold
Engine identity
Oils and fluids
Service and parts data
Common and chronic problems
- Balance shaft chain wear in early M271 engines
- Electrical issues with ignition coils
- Rust in rear wheel arches under certain climates
First checks
- Inspect timing chain and tensioner condition
- Check for oil leaks from valve cover and oil cooler seals
- Verify transmission fluid condition and service history
Avant de remplacer des pièces
- 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 equipment options vary significantly by region; US models less likely to feature diesel engines.
- Coupe body style was introduced late in the W203 life cycle; availability varies by market.
- This profile covers the main global production engines and transmissions available in 2005.