My AIRBAG light has been a problem for a while now. Although I've taken it to independent shops to get some codes, it turns off after they reset it...but comes back on after 3 weeks or so. This has happened twice now. The second time, the shop said that they had to take off my after market radio because apparently, with it, the vag tool wasnt reading it.

I just took it to a friend who had a vag and he tried to read it w/ it on, and it wouldnt read it at all...none of the controls or anything.

What wrong? I've tried searching, but I couldn't find the answer I was looking for.