2007, mecury mountaineer, ford explorer, door keyless entry code is located on the fuse panel under driver side dashboard, it is called SJB smart junction box, it is a 5 digit code printed about 1 inch from the bottom of the fuse block, you can not see the number off hand because it faces the metal frame of the car. stick your cell phone between the car and the fuse panel and start taking pictures! here is a picture.



it is located on the smart junction box (sjb)

I used my camera like this to get the code printed on the sticker. (Note this is just an example; this explorer did not have a keypad option so there is no 5 digit code on this sticker but it would be there if it did)








here is another picture on an 07, I think after 07 they went to the sticker method.

this picture was taken again near the e-brake pedal. I blured out the rest of the code.



Zoomed in on photo



as you can see there is the code in less than 5 minutes, and no tools required.
also check this link,

http://explorerforum.com/forums/showthread.php?t=295870

or this

https://www.ford-trucks.com/forums/1...ml#post9958750