How to Replace an ABS Speed Sensor in a BMW

1. With the car in park, pop the hood and disconnect the battery cables with the appropriately sized socket wrench.
2. Jack one side of the car up and use the lug nut wrench to remove the lugnuts on one wheel. Pull the wheel off, reach in behind the wheel column, and locate a small black box. Use the socket wrenches to remove the mounting screws on the edges of the box and slide it around to look at the underside of the box.
3. Pull the tabs on either side of the small round speed sensor and disconnect the wiring harness underneath. Pull the ABS sensor free and then place the new sensor.
4. Reattach the box and mounting screws on the back of the column and then replace the wheel. Repeat Steps 1 through 3 on the remaining wheels that have bad ABS sensors and then take the car for a test drive to make sure the sensors are working.