My info shows you have passlock security system. The key is just a mechanical key, the key doesn't have a pellet or transponder. A locksmith should have been able to make you a new key and it should have worked fine. It's the tumbler that communicates with passlock, not the key.
Since you busted it, I doubt I can help. You need a new lock cylinder, probably a new passlock sensor, then you need to program it.
SOURCE: anti theft device for 97 ford expedition
I have 2007 expedition XLT and the interior light blinking all the time what the solution ?
SOURCE: anti theft system
The chip is in the key. Either the key has lost it's program or the transceiver is not recognising the key. Try another key if you have one.
SOURCE: Car won't start - anti-theft light flashing
it sounds like the immobilizer is faulty. this will shut off the electrical feed to the starter motor. you will need to take it to a garage to get this fixed.
hope this helps.
SOURCE: anti theft code P1629
try leaving the key on for 5 to 10 minutes
for the BCM (body control module) to relearn
SOURCE: 97 sunfire tried turning key
This 10 minute re-learn process only works if there is a small Hiccup or Glitch in the system. If that 10 minute trick did not work, it means that some part of that antitheft system is legitimately failing and would need to be fixed or bypassed. This link offers 2 different ways to bypass the system. Ive done both of these bypasses dozens of times, they both work and will not hurt the performance of your vehicle http://vatspasslockpasskeysecurityhelp.yolasite.com/
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