How to replace crankshaft position sensor on BMW E46 323i (M52TUB25)

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How to replace crankshaft position sensor on BMW E46 323i (M52TUB25)

Symptoms of a failing sensor:

• Engine misfires
• Difficulty starting
• Check Engine Light on (code P0335)

Tools needed:

• 10mm socket
• Flathead screwdriver
• Torque wrench

Replacement procedure:

• Locate the sensor on the engine block behind the starter motor
• Disconnect the electrical connector
• Remove the 10mm bolt securing the sensor
• Carefully pull out the old sensor
• Clean the sensor hole and ensure no debris is present
• Insert the new sensor (BMW part number: 12141438082)
• Secure with the 10mm bolt, torque to 6 Nm
• Reconnect the electrical connector
• Clear fault codes with an OBD-II scanner

Note: Always use OE or high-quality aftermarket sensors for reliable performance.