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rear parking sensor not beeping anymore???


Junior Member
I have a 2009 Lincoln MKS and the rear parking sensor does not beep? in my setup, under the radio controls I switch over to "rear parking sensor" where it says ON OFF and it lets u toggle between them?? . well mine does not let me even toggle? I checked the 4 sensors on the rear bumper and they all work, I had my wife put the car in reverse and I put my ear up to each sensor, and yes they are all ticking!!??!! what could it be? do you know where the REAR "rear parking beeper" is located? maybe I can try to switch it out for a new one? is there a module or something that controls it? if so where is that? thanks for any help...