This is a real common problem with Fords. The door ajar switch is inside the doors mounted on the latch itself. Get yourself a can of spray lubricant of some sort and liberally spray down the latches from the outside of the doors and open and close them a few times. This usually will take care of it. I would avoid any procucts like WD-40 or any kind of "rust" breaker. These are corrosive, and just make the problem worse. Hope this helps.

Answered by James W.
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