To remove

Open the bonnet.
Detach the main fuse box and move it aside.

Fig 1: Illustration For Step 2-3, 5
Courtesy of SAAB-SCANIA OF AMERICA, INC.
Separate the connector, press in its catch and remove it from the bracket.
Snip the cable tie on the suspension strut tower.
Unplug the level sensor's connector. Also detach the expansion tank and move it aside.
Raise the car and remove the wheel.
Clean the area round the wheel sensor using a soft wire brush.
Undo the wheel sensor retaining bolt and remove the wheel sensor.

Fig 2: Illustration For Step 8-10
Courtesy of SAAB-SCANIA OF AMERICA, INC.
Remove the grommet and withdraw the lead.
Detach the lead from the clips and lift out the sensor.