I have a2001 NB... Just bought it todayand I picked up a vag scanner so I could keep on top of problems. The cat didn't come with the manual, but I have figured or most things with the exception of a small printed circuit card under ethe dash....its to the right of the column, opposite the obd port. It's plugged into a port with some wires going to it. .. But it just slides right out.... No case around it. What is it. ...lol?