2004 BMW 330Ci M54B30 (E46)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Rear subframe corrosion (common in northern climates)
• Vanos system wear leading to rough idle or power loss
• Cooling system components wear and leaks

First checks

• Inspect VANOS seals and actuators
• Check rear subframe mounting points for corrosion
• Verify cooling system integrity including thermostat and water pump

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 2004 330Ci was largely consistent globally but minor variations exist for emissions and transmission options depending on market.
• Oil capacity quoted includes filter change as per BMW service manuals.