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If you don't have the original code you can't. If you have an aftermarket radio, you can't. I can reset them with my scanner. But not if the radio isn't factory. I don't know if the dealer can. Call around.
The factory code is usually listed in the owner's manual.
If someone changed the code, then you will have to take it to a dealership to have the code reset.
In the 2002 Mercury Mountaineer, especially with the 3rd row
seat, remove the trim panels at the rear of the back door and at the tailgate on
the passenger side. You will see two panels where the wall seat belt is located, remove the top
panel first and then pull the lower panel out.Then pull the lower trim panel forward CAREFULLY. Towards
the front (near the door opening) you will see a small black box (says Security Unit) On it in fairly
small print will be the 5 digit code.
[ONE set of FIVE numbers and that is your CODE number.]
My husband had the same problem with his 02 Mountaineer about 6 months ago. I read somewhere that if you take WD40 & spray the door locks it should stop. We tried it & so far it's worked. Good luck!
Stop by a dealer. Give them your Vin# and they should give you the factory code.
Then stroll into the service bay, like you own the place,get a tech off on the side, to write down, how you progam your own code,into the keyless entry pad
Do you get a "Door Ajar" warning? If so that is keeping the light on. On my 03 Mountaineer, the rear hatch emblem has a crack around it that allowed the door sensor to think the door was open.
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