2003 BMW 3 Series 325xi M54B25 (E46)
E46 / Sedan / Touring / North America, Europe, selected global markets
M54B25Exact year/trim recordGold
Engine identity
Oils and fluids
Service and parts data
Common and chronic problems
- Rear subframe mounting point corrosion (North America)
- VANOS system rattling and failure
- Cooling system leaks (water pump, radiator)
- Transfer case issues in all-wheel-drive models
First checks
- Inspect rear subframe bolt integrity
- Check VANOS actuator functionality
- Verify transfer case fluid level and condition
- Check cooling system for leaks and 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
- 325xi refers to the all-wheel-drive (xDrive) variant of the E46 325i.
- Available mainly in North America and Europe; some markets may have slight specification differences.
- All-wheel-drive transfer case requires periodic fluid changes.