parking brakes & gas doorlight on 2005 Ford Taurus

The parking brake light and the gas door light stay lit - even when the brake is disengaged and gas door closed. This first happened when the temperature dropped below zero and now the lights stay on all the time.

1 answer
I would start with the parking brake warning switch available at the dealer for $10.78. I don't see a switch for the fuel door, hopefully changing the parking brake switch will solve both problems.