The 1991 Audi 100 and 100 Avant represent Audi's commitment to sophisticated engineering and design within the executive mid-size luxury segment. These vehicles, built on the Typ 4A chassis, are distinguished by their aerodynamic styling, advanced Quattro all-wheel-drive system, and a focus on driver comfort and build quality. Powered by a 2.3-liter inline 5-cylinder engine, these Audis offered a blend of performance and refinement, competing with established European luxury brands. Their introduction marked a significant step forward for Audi, laying the foundation for future models and showcasing the brand's evolving design language and technological prowess.

This comprehensive service and repair manual provides detailed, vehicle-specific information for all 1991 Audi 100 and 100 Avant models. It covers a wide range of systems, including engine mechanicals, fuel injection, transmissions (manual and automatic), drivetrain, suspension, brakes, steering, and electrical systems, as well as bodywork and HVAC. The manual includes essential procedures for scheduled maintenance, diagnostics, component repair, and technical specifications such as torque values and fluid capacities. Its purpose is to equip technicians and owners with the knowledge necessary for accurate diagnosis, effective repair, and proper maintenance, ensuring the longevity and optimal performance of these vehicles.