Raise the car and support it safely. For the front wheel speed sensor, work in the junction box located in the wheel housing to separate the electrical harness. Unscrew the sensor mounting bolt at the steering knuckle and remove the sensor. The installation process is the reverse of removal, and a thin coat of Staburags®NBU 12/K or equivalent grease should be applied to the speed sensor and housing. For the rear wheel speed sensor, first remove the right wheel well housing liner. Again, work in the junction box in the wheel housing to separate the electrical harness. Unscrew the mounting bolt in the rear wheel bearing carrier, and the installation is the reverse of removal, with a thin coat of Staburags®NBU 12/K or equivalent grease applied to the speed sensor and housing.