2000 jag s type 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 !
Try disconnecting the ground cable. Let it set for 20 minutes. Then reconnect and turn the key on and off 3 times not trying to start the car. This will reset the computer. Maybe that will work for you.
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I replaced the stripped out ignition cylinder in a 2000 merc cougar for a friend the key now turns and the accessories light up but it will not turn over
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