On top of that, the aero package is also another case where the bumper will have to come off in order to replace one of the sensors. As about finding the dead sensor, it can be done either through a diagnosis tester or by touching/listening to them, like the thread flyingmachine mentioned. Other culprits can be bad wiring, loose connectors, water infiltration creating a short, or even dead PDC module (the one in the trunk).

You are welcome. I did the placing my ear closed to the sensor test and one was not buzzing. It was a one man job. I used some boxes to hold one side while I unscrewed the other. But I am still having the same problem and all the sensors are buzzing.:dunno: Don't know what to do now?