Programing key how do i reprogram my jag key after changing the battery on a (X)type..03?

try reprogramming it by sitting in with doors closed switch ignition on then off 5 or 6 6 times until a beep then press any button on remote to program you may have to repeat on spare keys

it needs programming using suitable diagnostic equipment using jag software i.e. jaguar wds. or ids.i don't think there is another way to do it.

Replace the battery in the remote.

Look here for info http://www.bluejag.co.uk/XType_keyfob_battery_replacement.php splitting the key parts is difficult but a sharp knife will do it.

u must program it!

You don't.

It's moulded in during manufacturing; all you can do is buy a complete replacement key and get it programmed to the car (take all of your Jag keys along as they all get reprogrammed together to the engine ECU).

try to do service care and ask them to change the lock and get a new key......problem solved..else go to local shop and change th lock which will cost low

Your car has a module for the FOB , that could need to be replaced and programmed , or just to reprogram keys again

Sounds like it lost it's program. Go to the Jag dealer and get it reprogrammed.

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.