The Audi 100, specifically the Fourth Generation (C3/44Q) model from 1990, represents a significant achievement in German automotive engineering. Known for its pioneering aerodynamic design, which contributed to excellent fuel efficiency and a quiet cabin, this executive sedan and wagon offered a premium driving experience. Key features included the availability of the renowned quattro all-wheel-drive system, providing superior traction and stability, and a comfortable, spacious interior. The robust German engineering ensured reliability and a sophisticated feel, positioning the Audi 100 as a strong competitor in its class, celebrated for its advanced technology and build quality.

This comprehensive workshop service and repair manual provides detailed information for the maintenance, diagnosis, and repair of the 1990 Audi 100. It covers all major systems, including the engine (mechanical and electrical), fuel, cooling, lubrication, exhaust, transmission (manual and automatic), drivetrain, suspension, steering, brakes (including ABS), body electrical, and climate control. Included are routine maintenance schedules, in-depth repair procedures, overhaul instructions, troubleshooting guides, and essential technical specifications, such as wiring diagrams and torque values. This manual is an indispensable resource for owners, mechanics, and technicians seeking to maintain the performance, safety, and longevity of their Audi 100.