Audi A4 of the second generation (B6) appeared on the market in November 2000 and was produced until 2006 inclusive. Here you will find detailed instructions for the repair and maintenance of this vehicle. All articles are accompanied by explanatory illustrations that help to understand the essence of the procedure.
This manual includes a description of all types of powertrains fitted to this vehicle:
Gasoline: Inline 4-cylinder and V6-cylinder, water-cooled, DOHC type, volume from 1.6 to 3.0 liters, power from 102 to 220 hp.
Diesel: in-line 4-cylinder (OHC) and V-shaped 6-cylinder (DOHC) with water cooling and a turbocharger with a volume of 1.9 or 2.5 liters, power from 100 to 180 hp.
See here for more detailed engine specifications, codes and specifications.