I have a 03 expedition with a back up sensor issue. I tried cleaning the sensors in the bumper off and the reverse alarm still goes off like there is something behind me can anyone else give me some more ideas were to look. Thanks

 

I would start suspect that one of the sensors is no good. You might have to bring it to the dealer to have them plug in their computer to determine which senor it is. Unless all of the sensors have the same part number. Then you can buy just one and swap one at a time until the problem clears up.