We have some pretty smart people on this forum so i was thinking of all my years in the business I have seen some pretty unusual/crazy problems and the repairs I had to do that solved it was something no one would believe.
So in that light I thought it would be interesting to hear what others have seen and repaired. Don't need to go into detail or even what kind of vehicle it was if you don't want to.
So I'll start with one of my many.
Years ago had a car that was at 2 other places and the problem was the car would NOT SHUT OFF. Turn the key off and it would keep on running. Everything in the car worked as it should. Had to pull the coil wire to shut the car off.
Had to change the instrument/gauge assembly.