Had truck scanned and found that park assist #2 # 3 were bad. Replaced with Dorman 684-011 sensor and it worked again. Now intermittently it will turn off then I reset it and it will work again. Soon after it reverts to Park assist issue. Decided possibly new sensors may be slightly different even though they are supposed to be the correct ones. i replaced all 4 so they matched, removed positive battery cable and replaced it again. It seemed to work but back to original issue. Is there a code that is locked in and has to be cleared? Is there a way I can clear it. Can you tell me where to test sensor wires with meter if I need to do that?

 

Can someone tell me why my truck is not sounding the horn when I open the door with the key?