2004 BMW 330xi M54B30/M54B30TU (E46)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Rear subframe cracking due to chassis mounting points
• Window regulator failures
• Cooling system components wear (water pump, thermostat)

First checks

• Subframe integrity check recommended
• Cooling system pressure test
• Check VANOS operation

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

• 2004 was the last model year for E46 330xi in North America before E90 generation rollout
• Exact power output and transmission type vary by market and model configuration