Have Ford questions? Ask a mechanic for answers ASAP
Welcome, I'm Chris (aka-Moose).
Does this only occur with the car off and locked?
While driving do you ever get the courtesy lamps coming on for no reason or a false door ajar warning?
Is this the OEM alarm or an aftermarket one?
Does it occur with the car not locked?
The alarm is going off due to the system seeing power use or something ajar while locked. A faulty door ajar or hood ajar sensor is the normal cause for this concern. Since you said you have had a door ajar issue then more than likely that is the culprit here. A scan tool can monitor all these sensors and tell you which is failing.
You now will see a rating scale 1=bad to-5=excellent because I have posted a full or partial answer instead of an info request. When you rate I get a portion of the deposit you made, no rating means you still paid, but I earn nothing. My goal is understanding your question, and addressing it in full detail. In return, receiving a 5-star rating. Rating does not close the post or stop the conversation. Please keep in contact and reply as much as needed. Thanks, Chris
You are welcome