How to Repair a Faulty BMW Eccentric Shaft Sensor?
2 Answers
Check whether the wiring harness between the DME and the eccentric shaft sensor is damaged or short-circuited, and whether the connectors are dirty or loose. Check if the center magnetic wheel mounting bolts have been magnetized, as magnetization can cause the sensor to completely fail. Test the eccentric shaft sensor by replacing it with a new one to see if the fault code changes. If there is a change, it usually indicates an issue with the sensor itself.
I've encountered several cases of BMW eccentric shaft sensor failures, which usually require a thorough check of fault codes and reading data streams with specialized tools to diagnose the issue. First, disconnect the vehicle's power supply to ensure safety, then locate the sensor position typically near the engine, carefully unplug the connector and remove the mounting screws. If the sensor itself is confirmed to be faulty, replace it directly with an OEM or high-quality aftermarket part—never opt for cheap counterfeit products. After replacement, carefully inspect the wiring and connectors to ensure there are no loose connections or corrosion. Finally, connect the diagnostic tool to clear fault codes and test whether the engine runs smoothly. Throughout the process, take care not to damage surrounding components, and it's best to wear protective gloves. After completing the repair, a brief test drive is recommended to observe engine performance and prevent recurrence. Regular vehicle maintenance is key to prevention.
