2005 BMW 325xi M54B25 (E46)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Rear subframe mount cracking
• Vanos unit seals wear
• Cooling system hose and water pump leaks

First checks

• Inspect rear subframe for structural integrity
• Check oil consumption and valve cover gasket leaks
• Verify cooling system condition and thermostat functionality

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

• The 325xi is the all-wheel-drive variant of the E46 3 Series with the M54B25 engine as the main engine worldwide.
• Specific markets may have had different optional transmissions and minor equipment variations.