If you get a new remote or change the battery in your remote you may need to reprogram your vehicle to accept the keyless entry remote or key fob. This procedure works for a lot of 1998-2008 ford vehicles, see below for vehicles that the procedure works on and vehicles that use a slight variation on this procedure. I attempted to get this list accurate, I apologize because mistakes were probably made.
Read moreKeyless entry remote programming for Ford 1995-2008