Hi, Im pretty new to the Audi scene, i have just bought a 2002 A4 3.0 convertible, with 66000 miles, while going down the motorway the Emissions control light came on, I took it to a company called Dialynx and they pluged it in to there diagnostics and said it was coming up with fault codes saying it was both cats gone which was unlikely so they will try some other sensor in the engine, they were really helpful....The question is have i been sold it with the previous owner knowing that both cats are on the way out