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if you spray the latch inside of your doors with wd40, this should take care of your problem. Over time dirt build up inside causing the signal not to be received by the sensor. hope this help.

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Q: Why does the door ajar light stay on 2003 Mercury Mountaineer?
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How do you fix the door ajar light on a 2002 mercury mountaineer?

spray your door latches with wd40.


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