You have breached the security system and it doesn't recognize the key so try your spare key or try to bypass the security system
SOURCE: factory alarm 97 grand prix
1st the system alarm is intagrated into the engine control electronics, it can not be disabled without poss damage to ther systems and controls, 2nd the most common cause of your issue is the sensor in the ignition lock cylinder being defective, this is the most common issue on all GM anti-theft systems.
SOURCE: 99 Ford Ranger won't start because of theft system?
try turning the key to the acc position and leave it in that position till the light goes off. if it goes off then turn key off and then try starting if that dont work call a ford dealership and ask a mechanic
SOURCE: theft light blinking/car won!t start
If you have key numbers on the door, you should enter the code, then immediately start the truck. If this does not work contact the dealer for a sequence to reset the alarm.
SOURCE: 200 jag stype no start anti-theft light flashing
Have you another key and fob ?
Try lock/unlock cycle with new key + fob. Your key may be corrupted.
Try also just unlocking the car with the key (not the fob) as soon as you unlock the door put the key in the ignition immediately and see if the car starts.
If you have your radio code it may be worth trying a total reset (leave the car unlocked) disconnect the battery and leave for 20 mins. then reconnect, most systems will then reboot and this MAY help?
Failing all the above it looks like dealer time - more ££ss
good luck !
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