How much for PATS repair on Ford Explorer?

I have a 2002 Ford Explorer with the PATS system. I recently had my service engine soon light come on and the code was for the PATS system. I believe there has been something wrong with it for a while, because my key fob and power door locks have never worked when the car is off, and my remote start recently stopped working. I believe these are all related to the PATS system. So, how much could it cost to replace the whole system? Or, if anybody knows, what exactly is wrong? My key still works, car runs fine, and the theft light blinks at a normal pace.

It's just a stupid little fuse that blows under the dash. I had a 2002 ford taurus sel.

Just a 20amp fuse.