From basic transportation to record-setting performance cars, Audi is a recognized leader today in innovation and cutting-edge technology. Growth in the automotive market for a broad spectrum of models has put a huge number of Audis on the road, and these cars will provide many years of potential repair and service opportunities. Getting to know the various models, repair techniques and a few shortcuts will help make repairs more routine and profitable.

In this article, I'll focus on common repairs we see on at least a weekly basis. The series of cars covered in this article will be the A4 and A6 line from 1998 to 2004. These cars are all very similar in design and equipment, and most repairs are consistent between models. Be aware that many Audi models are close cousins of VW models so they share platforms and powertrains.

Increasing numbers of distinct models, multiple manufacturing plants and countries of origin, and constantly changing technology make vehicle identification ever more important (See Photo 1), especially as it relates to obtaining the proper parts and data needed to complete repairs.

Most Audis will have engine and transmission ID tags that are easy to access and read. With many models, having the VIN is all that's needed to determine the drivetrain. I won't get into specifics in this article, but just remember that having a clear determination of the exact model and equipment will make p...