Well its easy to get the key to the alarm. But to get the key coded to the immobiliser you have to have the SKC code. (special key code). to get this you have to go to VW or have a program called Vagtacho. This will give a 4 digit code which you code the new key with. [Y]
I bought a new key on ebay - it has to have the exact same part number and frequency to be used on your car. Ive got someone to program it for me tomorrow evening. Hope it works, im not sure if i need a new transponder for the key yet. Will know more tommorrow. It depends on the year of the immobiliser and the version used.
my mate with vagracho tried to connect with he ecu and he cuodnt. Aparantly with audi ecu it's hit and miss. Took it to vw and they culdnt program to new key. Tbh it's so much hassle. I'm looking formoney back from eBay vendor