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)?

Tools needed:

• 10mm socket and ratchet
• Flathead screwdriver
• New crankshaft position sensor

Symptoms of a failing sensor:

• Engine misfires
• Difficulty starting
• Check engine light (code P0335)

Replacement procedure:

• Disconnect the negative battery terminal
• Locate the sensor on the engine block behind the starter motor
• Unplug the electrical connector
• Remove the 10mm bolt securing the sensor
• Carefully remove the old sensor
• Install the new sensor (BMW part number: 12141703277)
• Secure with the 10mm bolt (torque to 6 Nm)
• Reconnect the electrical connector and battery
• Clear fault codes with an OBD-II scanner

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