2001 BMW 325Ci M54B25 (E46)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Cooling system leaks (water pump, thermostat)
• Rear subframe bushings wear
• Vanos system failures leading to rough idle or reduced power

First checks

• Cooling system pressure test
• Inspect Vanos solenoids and valve
• Check rear subframe for play

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

• 2001 325Ci was officially sold in Europe and other global markets but not in the US until 2002 model year
• Engine oil capacity includes filter change (service fill)
• Transmissions offered vary by market and model year; US got 325Ci coupe starting 2002