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Do the front sensors give an error? I had a hell of a time disconnecting the rear sensor harness so I wonder if damage to it could cause problems with the front sensors.
Disconnecting the rear sensor was an absolute pain. After the recent software update everything is now working again, which confirmed my suspicion that it was a software issue not a hardware issue.
Also just had a Torklift hitch installed and I get "Park Assist Unavailable". None of my normal sensor beeping warnings (on screen and auditory) work anymore.