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Does the theft light blink when the key is in the ignition and you are trying to start the vehicle?
It sounds like the PATS systen has triggered the anti-theft in which it has shut the truck down. It can't "see" the keys being used to start the vehicle. This can be due to bad keys, lost programming, bad transceiver, or various other faults. You can sneeze sideways and the system will act up and requore the keys to be reprogrammed. It is a nuisance on these vehicle and very common to occur just as you stated it did.
Your only options are to try and get a locksmith to you that has the Ford programming ability or to tow to Ford to have them program the keys to the truck. You will need 2 keys for the programming so be sure to have both keys when you do so.
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