Hey, as you can see I'm new to this forum but I love this Audi!
The only problem or situation that I have is that my check engine light is haunting me.. and I've been told that it's a supposed air flow problem.. When i'm in 2nd or 3rd and let go of the gas there's this strange noise.. It's kinda like a funky rattling noise. I think it might be my diverter valve but again, I'm new to this car so any advice at all would be greatly appreciated.

Another thing is that my airbag light is on as well. If anyone is having or has had these problems in the past or know of any cost effective ways of fixing these problems, I would appreciate it. Thanks AF.