I have a 2006 S-Type. The buttons on one of the remotes started to fail so it was refurbished and I then took both keys to a local independant Jag garage that has the Jaguar computer to get it repaired with the car.

The sequence was followed, first clearing the car of any keys and then repairing them both together. The clear worked but the 2 x remotes won't pair with the car. Now I have no working remotes. It was determined there must be a fault with the module in the drivers door. A replacement module was sourced and I fitted it myself before heading to a different Jag dealer with the necessary equipment to pair the keys. Same thing happend, the sequence is followed, both keys were paired and the process completes with no errors shown on the computer. However the same result, neither key is paired with the car.

Anyone come across this before or know what to try next?

Might be worth checking if there's a separate receiver/antenna module for the keyless entry that's failed. I've heard of cases where the door module and receiver are two different components.