Need more info as to year but must Fords will turn the alarm on and off with the door key. If this is not happening you'll need to repalce the door lock cylinder and the keys. Ford for some reason only sells the lock cylinders as fours. You get the ign. cylinder both front door cylinders and the trunk cylinder. Cost can be about 250 bucks Just for the parts not installed. Key fob and reprogram about 150 bucks. You do the math and decide which way to go .
Gm tech for 20 years but own only Fords
I'd rather push a Ford than drive a Chev
Hope I helped
