2005 BMW 3 Series 330i M54B30 (E46)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Cooling system leaks (water pump, thermostat)
• Oil leaks from valve cover gaskets
• DISA valve failure
• Rear subframe cracks (in some markets)

First checks

• Inspect cooling system components
• Check VANOS operation
• Verify service history for timing chain tensioner

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

• The E46 330i was available globally with the M54B30 engine but power and emissions equipment varied by market.
• Some markets had sedan, coupe, and wagon body styles with trim and transmission options differing accordingly.