What are the different codes like A4 B5? Im new to Audi I bought my first a 2003 A6 3.0 Quattro.I always wanted a bmw until I drove the Audi! Audi is addicting I was looking at a A4 Quattro 2007 saturday.I almost bought it.I will keep my A6! I just thought the turbo would be a nice addition.The turbo just didnt respond like the A6.

 

If you are asking about the B-series in the A4 and the C-series in the A6, it corresponds to the body style. Under the A4 main topic you will see the years that correspond to each B-series. I think my A6 C5 is 1999-2004, then they went to the C6 body style. I think it is up to C7 now, but I don't pay much attention because I am not in the market for a new A6.