The immo is separate. It is not in the ECU. Here you have Delphi Immo Box ( white one, behind the dash ). Inside is 93c46 ( masked one ). I don`t know a complete immo off solution for this. Try to adapt the Immo to the ECU or program a new key (I think that, you will need a new T5 transponder ). You can use VAG Commander or some other VAG thing...