This manual covers the Audi 100, model code C4-4A, produced during the C4 generation from 1991 to 1994. Known for its sophisticated design, strong build quality, and advanced engineering, the Audi 100 served as an executive sedan and wagon, competing with luxury marques like BMW and Mercedes-Benz. Key features include its aerodynamic styling, spacious interior, refined ride quality, and the highly regarded optional Quattro all-wheel-drive system, which provided exceptional traction. The vehicle was equipped with a 2.8L SOHC V6 engine, available with either a 5-speed manual or a 4-speed automatic transmission, and offered a range of technologies including standard cruise control and an optional ABS system. This comprehensive factory service manual provides in-depth coverage for all models and trims of the Audi 100 (C4). It details a vast array of maintenance procedures, from routine oil changes and timing belt replacements to complete engine and transmission overhauls. The manual also includes extensive troubleshooting guides, diagnostic procedures for various systems including engine performance, brakes, and electrical components, as well as detailed technical specifications, torque values, and fluid requirements. This resource is designed to assist owners, mechanics, and technicians in maintaining, diagnosing, and repairing the Audi 100 with accuracy and efficiency.