Today my 2003 Explorer “door ajar” light came on, I’ve had this light come on once before and had turned out to be the rear lift gate. Checking the lift gate was instinctively my first reaction, but nothing happened, then I opened and closed the hatch window… nothing, all doors… nothing, re-rechecked the lift gate, and aha!!! I found a ballpoint pen under the weatherstripping. Then I pressed the remote’s door lock button and instead of beeping once, meaning that it was locked, it beeped twice, meaning that a door was open; this really annoyed me because I knew that all the doors were shut. To make matters worst, the interior lights and the side-view mirror lights would not turn off.
The problem was the door latch, which door? I really don’t know. So what I did was to spray WD-40 on all the door latches, the lift gate latch, and the hatch window latch. I sprayed every latch once and nothing! The” door ajar” light was still on, so I went back to every latch and with my key I pushed in the latch’s hinge to close it. I re-sprayed with WD-40 making sure I got everything really lubricated. This fixed the problem, no more “door ajar”! I guess the door sensors were dried out. I will just have to wait and see if the problem comes back or if this is a permanent solution.
