Hi,
I'm having problems using my OBDII computer on my 2002 a4 1.8t , as i plug the reader and try to read the only answer i get is error ,, does anyone know if the OBDII works in audis,, or if i have to have the car in a specific mode like(neutral or something like that) .
Second question ,
does anyone know the correct size for the rear rotors for the model mention above (02 a4 1.8t)?


Thanks in advance