66 20 535
Graphic shows rear wheel removed.
Release screws (1) on rear right wheel arch panel (2).
Release screws (1) and (2).
Remove underbody panelling (3).
Release retaining tabs (2).
Pull ultrasonic sensor (1) out of bracket and unlock and disconnected associated plug connection.
Before installation of ultrasonic sensor (1) on wiring harness, clean plug connection!
Make sure rubber ring (1) is correctly seated on ultrasonic sensor (2).