Ford door remote programming

[mjonesnh]

Have 2002 F-150. Have 2 OEM door fob remote transmitters and 1 of them still works but pretty beat up appearance wise. Bought 2 new aftermarket and have read instructions in owner's manual. My question is, if I just program the new ones will they be programmed with same codes as OEM or does the truck send out a completely new code and OEM and new ones all need to be programmed for all 4 to be functional?

 

[Midniteoyl]

They should all work. I had 4 for my last truck.

 

[BravoXray]

It's a one way system, the fob sends out the code and if it's correct, it unlocks the doors. The fobs are only a transmitter, and each one sends out a unique code. When programming a new fob, the truck's BCM registers the new fob's code as a valid code to unlock the doors. I've programmed new fobs to my '06 F150 a couple of times with no problems.

 

[mjonesnh]

Well, tried just registering the new fobs and that worked for them but deactivated the OEM ones. Had to go through procedure again this time with all 4 fobs and that set all remotes to same code. Guess the OEM had to get new code sent like aftermarket ones.

 

[Midniteoyl]

That's weird.. May be due to the model year and old software, but on my 2019 F150 at the time, I just put the new fob in and programmed it. The other 2 stayed working, no problems.

When I got a fourth from the dealer, it came already programmed via VIN, also no problems - Which is actually kinda scary.

 

[Flogger]

Fords typically will store 3 or 4 fobs before pushing them off the back side.