My 2002 ford explorer xlt door ajar light stays on when all doors are close what is my problem

I would first check the door sensors by opening the door and pressing the sensor with your finger. Try this on all of the doors. Second you may want to check the door striker alignment. Last, you may find that your door actually needs some adjustment to fit the door jam.

mine was the "door ajar switch assembly" that is fairly simple to replace

Mine is a 2003 and it does the same thing you may have knocked a wire loose thats what happened with mine

My 2002 Explorer had these symptoms: 1) Door ajar light on 2) Power mirrors not working 3) Driver's side door lock switch not working On this car the switches are integral with the door latch inside the door (not on the door jamb as in older cars) I sprayed WD40 on all the latches in an effort to free up a stuck switch (as suggested by other folks) but this did not fixx the problem. I took off the door inner panels on the 2 front doors and the rear hatch but couldn't find a bad connection. In the end it turned out to be a bad ground wire to the driver's door. I spliced a wire onto the black wire going to the driver's door lock switch and ran that to a bolt head inside the door which provided a ground. All the problems were FIXED!