I have a 2001 Ford taurus ses, Vulcan. I have checked every single fuse both in the engine compartment and under the dash including the mega fuse. The battery is only about 2 years old and fully charged as well. Recently, for some unknown reason, out of the blue when I went to go to work the anti theft kicked on and is not allowing me to crank or start my car. I have no radio, and the theft light is flashing rapidly. The car started and ran fine the day before. I tried going through the re learning process (key on 10 minutes) and it doesn't seem to work. The theft light does go from flashing rapidly to flashing intermittently, but when I shut the key off, wait and try to start it, it starts flashing rapidly again. It is like the car has learned the key but when I shut it off and try to start it for whatever reason it's going back into theft mode. I have another 01 Taurus Vulcan (the only difference is my parts car is a flex fuel, the daily driver is not) that the trans blew up in and it rusted out, I guess my question is if I take the key cylinder and pcm out of the parts(the trans blew up in) and install it in my daily driver that has the theft problem should that in theory correct the problem, or is it a decent starting point? Should that work or would the pcm have to be reprogrammed to the new car? I called the dealer and they said it sounds like the pcm on the theft car needs refreshed which they said itd be 350 to 550 to do that, it's only a 800 dollar car, so I'd rather not sink that much into it. Is it just a matter of taking the big wiring harness off the pcm and then the 2 bolts next to the connector to change them? Sorry for all the questions, I am by no means a electrical or electronics genius, and I dont have alot of money to spend, nor do I being it's a beater with a heater, I'm just trying to get it back on the road.