Parking assist distance sensors should be serviced by first unconnecting the battery negative cable. Undo the wheel flare in the back and, on the side of the car with service required, loosen the bumper fascia. From where the fascias connect to the liftgate, remove the parking assist distance sensor connector from the wire harness. Unlock the sensor bracket hook features by pulling the top and bottom hooks away. After that, take off the O-ring spacer from the bottom of the sensor membrane. If parts need to be serviced, the parking assist distance sensor and sensor spacers can be reached separately, but the sensor brackets are mounted to the rear bumper by adhesive.