How to Replace the Speed Sensor on a BMW 528E

1. Loosen the lug nuts with a lug wrench. Lift the vehicle with a floor jack at the corner of the vehicle where you will be replacing the sensor. Lower the car carefully onto jack stands and ensure that it is supported safely. Finish removing the wheel and set it aside.
2. Locate the speed sensor. It has a wiring harness integrated into the end of it and is inserted into the back of the hub from the side facing the wheel well. It may help to clean the area around the sensor with degreaser, a wire brush and a rag to be able to see the sensor better.
3. Remove the small Allen bolt that holds the speed sensor in place with an Allen wrench. Do not misplace the bolt. Pull the speed sensor straight out. It is a couple of inches long. It may also be seized into the hole in which it is installed from dirt and oil. Spray penetrating liquid around the area where the sensor is installed if it is frozen on. Tap the sensor lightly once the bolt is removed to see if you can get it to spin a little and then work it slowly out. Do not break the plastic housing, as removing it would be extremely difficult.
4. Disconnect the speed sensor harness. Plug the new speed sensor harness in. Slide the speed sensor into place, ensuring that it seats fully, so that end of the sensor will make contact with the pulse wheel. Line the hole in the sensor up with the hole for the Allen bolt and then reinstall the bolt. Replace the wheel. Lower the vehicle off the jack stands. Tighten the lug nuts and then take the vehicle for a test-drive.