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hi, try disconecting the battery for a couple of hours and try again but make sure you have your stereo code. if this does not work your key fob may be out cync with your ecu and will require reprograming it is easy on x type , you can do it your self ,you can find the instructions in jag forums or ebay for 1.99
The switchblade key would need to be compatable with your ignition switch barrel. Only normally available from jag dealers who check the Jag owners register before supplying you a replacement.
The older type seperate fobs could be programmed by switching the ignition on and off 8 times (allowing all functions to settle) and on the 9th switch on - press a button on each fob and then switch off. to test use a good fob to lock the car then try the reprogammed fob to unlock/lock. Sometimes this works first time - sometimes needs a couple of tries.
it sounds like the module to the alarm in the car is going bad. the sensor that detects for jags is the tied into the dash speedometer so this will need to be swapped out by the dealer only. the module will also need reprogrammed and rechecked after the reprogramming.