door ajar light on 2002 ford explorer?

Turn ignition to run position, you don't need to start. This turns off the dome lamp delay. Roll up all windows to prevent any spray from getting on glass. Use silicon spray (wet type) or a spray lubricant with graphite. Spray door latches one at a time, close and open the door 10 - 20 times, if lamp goes out just lube latches more often than you have been. If dome lamp stays on after all doors have been lubed take to a dealer. They can monitor each door with the scanner to determine what door shows ajar and replace that door ajar switch.

take a fresh can of wd40 and work over the locks and the window channels on that car- open all the doors and insert red extension tube in all locks and and all latches that you can find-put it into holes by the latches on the buttons on the door into the door openers that you wouldnt think can use lube-do every door thouroughly even the rear hatch-wipe up excess with a towel-while you are doig it open and close door 6-7 times each and relube