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Anyone out there have a problem with the door ajar light staying on even when all the doors are shut tight? My 2002 Ford F250 has recently started having this issue. The dome light stay on too. Then after driving a bit, the doors automatically lock, the dome light goes off, and the dash light goes off and all is OK.
Try spraying some WD40 in your door latch mechanisms. In some models theres a switch in there that can get gummed up and the WD40 can clean it up.
+ 1 on the above..... really SOAK the door latch area in ALL doors. Open/close doors a number of times....if it didn't go out then, spray once more and wait overnight. 9 outta 10 this works!