You cannot change the master code. In your owners manual is a procedure for creating another code. But the master cannot be changed.
You cannot change the master code. You can add other codes, but you cannot change the master....
On hinge in trunk, may also be in front of owner's manual (which tells about programming it).
inside the car
Open the trunk and look at the trunk hinge, the code is there. If it isn't you will need to go to a Ford dealer so they can reset the code.
Instructions are in the owners manual. You can probably refer to this on line if you don't have the book.
Underneath the trunk lid
Code p0430
the door code number is on a sticker inside trunk lid
look on the trunk hinge there should be a sticker with the code on it
The dealer should have that information. Also it may be in the owners manual. If you don't have one, try MOTORLIT.COM
my van will crank, but won't start, had spark plugs change
You won't know until you get the code read.