Damn I havnt done it in ages mate & I'm talking about remote functions only, not immo, had S3 for 7 years & think did it twice, then had vagcom, something like one one key in ignition, one key in door lock with door closed, then lock door, click once or twice think was determined by the key number, so 2nd key was 2 clicks & then unlock car then click again number of times, that isnt the definitive method you understand, just some vivid memories from long time back, I'm sure someone on here will advise with the B5/8L cars given was practically the same, but funny enough didnt work for all, so maybe revised modules turned the feature of, all I know is it worked for number of people.