You posted on my Question. Well I posted this as a comment.
"Ok. I just went out to the car and I put the key that doesn't work in
the ignition to the ON position and the theft light flashes. I took
that key out and put the one that works in to the ON position and the
theft light stays on for a second and then goes out. Could that key
have been "locked out" of the system."
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You can probably go to a junkyard, and steal the tumbler out of another cars ignition, just make sure that you have the set of keys to go with it. As well, if your ignition key is for your locks as well, make sure that you take those tumblers out of the door because you'll need those as well.
It could be that chip inside key just went bad. Do u have a 3rd key? That works? If so take the 2 good keys and turn the igntion to run postion for 3 secs each then do the same for the 3rd key and this will reprogram it if the chip is ok. If you do not have 2 good keys then u will have to have a scan tool that will link up with PATS system and perform security access to reprogram it.
the chip in the key has gone bad . this can happen real easy .....at the checkout counter in most stores there is a device under the counter that when you buy something the checker drags it across to deactavate a small chip so you can leave the store ....... this device can KILL THE CHIP IN YOUR KEY so keep keys clear of it ......this key must be replaced it cannot be reprogramed
Ok, If it is the Factory Key, It should have the Plastic Finger grip at the Top. This Finger Grip has a Transponder Chip inside that Tells the Ignition that the Key is the Correct Key for this car, Go ahead and Start. These Transponders do Stop working Sometimes. If you will take the Key to the Dealer they can Reprogram the Key to work for you. But, It has to be the Factory key for this. If you have had a Key made, The key will not have the Chip inside it and will only work on the Doors. Please Rate my Response, I need all the Help That I can Get! Thanks!
Either you may be using a key that you had copied from the original or your chip went bad in your original key. Most of cars now a days have the key censor in the key so if it is the incorrect key it will not start your car or if it does not read that chip it will not start
HI, I'm reading your problem,
Let me explain something about your car.
2005 Ford Taurus, The key on that car has Chip inside of the key and receiver on the ignition switch,
Check if the key you are trying to use is Black and has a plastic head.
If not you need a key with that characteristics.
But if you have the right key, Remenber if you had drop on the floor, or hit with something,
Because some times they come damaged, with insignificat thins.
Remenber if you left the key close to a magnets like speakers.
If nothing aply at your case, you need to call a place Aloha Smith, they have the computer to program or reprogarm your key. IF not you can't start your car.