Car key fob not working and locking car

you may have the battery in backwards

Might be some obstruction in the lock cylinder itself.

pop open the key fob from the side and you will notice a watch battery inside the fob, replace it and make sure nothing came unsoldered from the board and that should fix the problem

If the car goes "beep beep" when you try to lock the doors something is still open.
otherwise
Sounds like a defective keyfob try a new battery, try your spare if you have one.
If you don't have a spare you should get one anyway.
You can match your new keyfob to the car by following instructions here:= http://www.bluejag.co.uk/X-Type-keyfob-reprogramming.php

The only way is to go to Jaguar , sorry

you may also want to look at

http://www.fixya.com/cars/r7339652-release_jaguar_x_type_boot_trunk_lid

Insert your key in the ignition and turn it on and off. Push the Arm button until you hear it lock. That does the trick for me always. I own a 02 jag myself.

start the engine and then turn off and lock ur steering and it will work

Seperate key fobs only can be programmed in the following way.

Turn ignition on/off 8 x times (allow all functions to stabilise) after the 9th on - press a button on both remote fobs. then turn ign. off. use good remote to lock and then try new remote to unlock/lock. sometimes it works first time - sometimes you have to repeat actions. good luck.

I am assuming your problem is similar to mine; the key fob isn't dead, but for some reason the boot won't release.  This happens rarely, but can be very frustrating (and embarrassing)!

When neither the key fob nor the release on the boot work, lock and unlock the car, and insert the key into the ignition.  Turn the key to the second stage, i.e. the accessories are powered, and then remove the key.  This ought to allow you to use the fob again.