I have a 2003 Explorer and I had the same problem- it also kept my dome lights on. I found a few wires in the door jam broken, once I spliced it back together the light went off and another broken wired controlled the remote mirrors fixed that one while I was at it also
check the sensor on the door, its probably bad
If the door ajar light is coming on in your gauge cluster, and the warning chime is sounding when all your doors, liftgate, and glass hatch are securely shut you most likely have a sticking door ajar switch. The door ajar switches are inside the doors mounted on the latch mechanisms.
The "door ajar" warning light on your 2002 Ford Explorer may be flashing due to a malfunctioning door switch, which detects whether the door is fully closed. It could also indicate that one of the doors or the rear hatch is not fully closed or that there is a wiring issue. Additionally, dirt or debris in the door latch mechanism can cause the sensor to malfunction. Checking each door and the rear hatch for proper closure and inspecting the door switches can help resolve the issue.
Is door ajar light on also?
Yes , there was a 2002 Ford Explorer Sport ( 2 door )
dont change it, take it off and clean it!
On my 2002 sportage 2-door, the door ajar light stays on when the tailgate is not locked. with the key.
sorry , no ( the 2002 Ford Explorer 4 door is a redesign - generation 3 )
The 2002 Ford Explorer ( 4 door ) has a 22.5 U.S. gallon fuel tank
Starting in 2002 the Ford Explorer ( four door ) does not have an automatic transmission fluid dipstick
this problem is related to the door ajar switch which is connected to the latch. spray wd-40 into the latch and it should go away.
Try spraying the 'button' located in the door jamb and working it. See if that helps.