Call a locksmith.
Yes, this can be done by a Ford dealer.
$20.00 at advance auto parts
At least $75
Use a 1999 grand marquis gs key!!
Use the key or remote.
Maybe the chip in the key is defective.
It seems like the 1998 grand marquis key-less entry model was the only model made where u would actually have to take to a dealership to have it program there as it requires a computer module to program it.. unlike the rest of all models where u would be able to program you're self.. with the key and keyless entry pin pad those procedures just wold not work on the 98 model.. have tried it out... and it not work..
it is broken
there is a spcial key required to remove them
turn the key to the on position ..till the lights in the dash board turn on .with a pointy object push in a passer under the ingniton swit and pull out ch
You will find it on the right hinge of the trunk