What is the complete process for replacing the eccentric shaft sensor on a BMW?
2 Answers
Disconnect the connector, remove the ignition coil cover, and use appropriate tools to lift the seal. Remove the eccentric shaft sensor seal. Slightly lubricate the sealing surface with engine oil, press in the seal using special tool 116420, and then connect the connector.
As someone who frequently tinkers with cars, I believe replacing BMW's eccentric shaft sensor should be done step by step. First, prepare tools such as wrenches and a new sensor. For safety, disconnect the negative terminal of the battery to avoid electric shock. Then, open the hood and locate the sensor's position, usually near the camshaft in the engine area—some models require lifting the car if it's underneath. When removing, first loosen the mounting bolts with a wrench, carefully unplug the wire connector without pulling on the wires to prevent breakage. After removing the old sensor, clean the installation area, as oil residue can affect the new part. Install the new sensor, ensuring proper alignment, tighten the bolts, and reconnect the wire connector. Finally, reconnect the battery's negative terminal, start the engine to test, check if any error codes on the dashboard disappear, and take a test drive to ensure smooth engine operation. Remember to wear gloves and maintain cleanliness throughout the process. If parts are hard to find or you lack experience, it's best to consult a repair shop first for specifications—after all, this sensor affects engine timing, and issues can cause shaking, stalling, or trip delays.
