Question:When I put my 2006 four-wheel-drive F-250 Super Duty in reverse, the backup sensor light stays on and I can't turn it off by pushing the button. The backup warning (beeper) worked fine ...

It has become a common sight, a must-have feature on modern cars, a row of ultrasonic sensors embedded in the rear bumper. They are part of a parking sensor, an aid to drivers for whom depth percep… ...