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the ignition key has a computer chip inside it. if you use the wrong key or that chip gets scrambled it activates the anti-theft. take your keys to a dealer and have them checked. if you have the vin they can test them. if you had a duplicate key made by someone other than Ford it won't be programmed for your vehicle. i had one made at the hardware store. it will open the door locks and turn the ignition, but not start it.

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Q: Why does my alarm go off when you try to star the engine on a 2004 sport trac and wont start?
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