For repairs at the front Parking Assist Distance Sensor, start by fitting the O-ring spacer, with the wide side at the sensor housing, the narrow side at the exterior sensor surface and by engaging the ring all around the sensor membrane's projection. After that, place the sensor into the back bracket of the front bumper until you hear and feel the latches snap over the top and bottom of the sensor, ensuring the membrane is flush against the outer bumper surface and the sensor is evenly centered in the openings without touching the O-rings. Then, plug the wire harness connector back onto the sensor connector receptacle, found at the back of the fascia, before fitting the bumper fascia to the car's front. Now, reattach the cable on the battery negative terminal to the rest of the wiring.