Here is a description of the repair and maintenance procedures for the second generation of the Audi A4 passenger car (code B6), which were equipped only with gasoline engines and were produced from 2000 to 2006. The engines of the following volumes and characteristics are presented: four-cylinder 1.6 liters (ALZ, 102 hp), 1.8 liters (AVJ, 150 hp) and 2.0 liters (ALT, 130 hp), as well as a six-cylinder V-shaped volume of 3.0 liters (ASN, 220 hp). See here for a detailed description of these motors.