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Necessary preliminary tasks:
Remove front left or right wheel arch cover
Disconnect plug connection (1) and unclip ultrasonic sensor from retaining tabs (2).
Clean the plug connection (1) before installing the ultrasonic sensor on the wiring harness!
Retaining tabs (2) must not be damaged!
Make sure ultrasonic sensor is securely seated.
Make sure rubber ring (1) is correctly seated on ultrasonic sensor (2).