a audi information cd is avalible at
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it is only ten pounds and contains information on all models, history of audi , diagnostic, fault codes, tips and tricks, has a good section on audi safety which is very interesting , did you know audi named the models after the bhp in the early days, i.e audi 50 was 50 bhp, 75 was 75 bhp super 90 was 90 , etc