Door Ajar light
I have a 2002 F-150 XL Super cab. Today for the first time the "Door Ajar" light stayed on after all doors were shut. I tried the WD-40 trick as my first attempt since it is raining. I soaked down the latching mechanism, opened and closed the door 5x, soaked it again, and opened and closed it 5x more. Sure enough, it went back to working as normal. If it does end up repeating the same problem again and again, I will take the advice posted of getting new sensors for the door. Thanks guys, AGAIN, for saving me some costly unnecessary repairs.
ARFordGuy
2002 F-150 XL SuperCab