2004 BMW 645Ci M54B30/N62B44 (E63)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Valve stem seal wear causing oil consumption
• Electronic throttle issues
• DISA valve failure in intake manifold

First checks

• Inspect VANOS system operation
• Check for oil leaks from valve cover gasket
• Monitor cooling system for leaks or thermostat failure

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

• The 645Ci was introduced for the 2004 model year as the coupe variant of the 6 Series E63 generation.
• Power figures and emissions equipment may vary by market and production month.