To remove

Raise the car.
Unplug the sensor.

Fig 1: Illustration For Steps 2-4
Courtesy of SAAB-SCANIA OF AMERICA, INC.
Loosen the upper link arm ball joint.
Unscrew the level sensor and remove it with the bracket.
Remove the sensor from the bracket by undoing the screws.

Fig 2: Illustration For Step 5
Courtesy of SAAB-SCANIA OF AMERICA, INC.