I have see on other post that some scan tools with obd2 generic work and othere do not. My old scan tool (Autoxray) did not work at first but I changed the location of signal ground, pin 4 to location pin 5 (which is chassis ground for the scan tools obd2 generic harness) on the diagnostic connection on my 2001 S3 and now I can read and clear my trouble codes. So, diagnostic harness on the bike. Take the black wire from location 4 and move it to location 5. I'll try and post photos soon.