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You can test each sensor with your cell phone. just put your phone in record audio mode and put the truck in a position that would turn on the sensors like reverse or in drive if your checking the front sensor (use a second person so your truck doesn't drive away) and if you hold your phone next to the sensor you will see some audio pulses on the screen, your can't hear them but your phone can. I fixed my Yukon by finding one bad sensor and it was $35 from the auto parts.