2005 BMW 3 Series 325i M54B25 (E46)
E46 / Sedan / Coupe / Convertible / Touring / Global (primarily Europe, North America, Asia with variations)
M54B25Exact year/trim recordGold
Engine identity
Oils and fluids
Service and parts data
Common and chronic problems
- Vanos solenoid failure causing rough idle
- Cooling system thermostat and water pump wear
- Rear subframe bushing wear in high mileage models
First checks
- Check VANOS operation and seals
- Inspect cooling system condition and hoses
- Verify transmission fluid condition
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 2005 model year 325i continued production mostly unchanged from the 2001 facelift (LCI) E46 generation.
- Market-specific emissions equipment and power ratings may vary; US and Europe differed mainly in exhaust tuning.