Hi I'm a totally new member. My wife has locked the keys in our 2010 Mountaineer twice in the last month taking her mom to dr.(she has cancer). Anyway could someone PLEASE tell me where to find the security code for the keyless entry. I'm tired of driving 70 miles to unlock door! HELP! David.(Dmerc

 

Don't know about the Mountaineer, but on a Grand Marquis, the 5-digit code is on a sticker on the driver's side trunk hinge.
The sticker is white with black numbers.
If you find the code sticker, re-program the code to your own 5-digit number that you can remember easily.
Don't forget to tell your wife what the new number is ! ;>)