See link. <http://www.audifans.com/kb/OBD-II_Reader> -- Kent McLean 1999 A4 Avant, V6 Tiptronic 1991 200 TQA #3, with mods 1990 V8 w/5-speed and other mods gone: '91 200 TQA x2, '94 100 S Avant, '89 200 TQ "Bad Puppy"