The 1991 Audi 100, representing the final year of the Fourth Generation (C3) model, embodies Audi's reputation for sophisticated engineering and understated luxury in the executive car segment. Renowned for its pioneering aerodynamic design, which contributed to excellent fuel efficiency and a quiet cabin, the Audi 100 offered a premium European driving experience. Available with front-wheel drive or the acclaimed Quattro all-wheel-drive system, this model was built with a focus on solid construction and high-quality interior materials. Its inline 5-cylinder engines, typically 2.0L or 2.3L, provided a balance of performance and refinement, complemented by either a 5-speed manual or 4-speed automatic transmission.

This comprehensive Workshop Service and Repair Manual provides detailed information for the maintenance, diagnosis, and repair of the 1991 Audi 100. It covers essential systems including engine mechanicals, fuel injection (Bosch KE-Jetronic), drivetrain components, suspension, steering, braking systems, and the complete electrical system with wiring diagrams. The manual includes step-by-step procedures for preventative maintenance, component repair, and overhaul of major assemblies, alongside vital technical specifications, torque values, and diagnostic troubleshooting guides. This resource is designed to assist owners, technicians, and mechanics in ensuring the optimal performance and longevity of their Audi 100.