Hi all, new owner and therefore new to the forum. Recently bought a 2003 x5 petrol and decided to have a lpg tank fitted (cheaper than buying diesel with same mileage/spec etc). As part of the lpg process a new battery was fitted. I've picked up the car today and only the tailgate opens remotely, the unlock and lock functions do not work on either of my keys. I have looked at how to reprogram the key but seeing as the tailgate opens fine I'm not sure that it actually needs reproramming. Any thoughts or help would be appreciated.