The Audi 90, produced between 1988 and 1992, represents a compelling blend of compact executive car luxury and performance-oriented engineering. Available in Coupe, Quattro, and Sedan variants, this generation, known internally as Type 85 and Type 89, built upon Audi's legacy of innovation. Notable features such as standard Quattro all-wheel drive on many models, a refined inline 5-cylinder engine, and premium interior appointments set it apart in its segment. Its aerodynamic styling and robust German build quality contributed to its reputation as a sophisticated and reliable vehicle, making it a strong competitor against other premium compact cars of its era.

This comprehensive manual serves as an essential resource for owners and technicians alike, covering the Audi 90 Coupe, Sedan, and Quattro models from 1988 through 1992. It provides detailed information on all major vehicle systems, including engine mechanicals, fuel and ignition systems, manual and automatic transmissions, the Quattro drivetrain, brakes, suspension, steering, and the electrical system. Furthermore, it offers extensive coverage of body panels, interior trim, and HVAC components. The manual's scope includes part identification with detailed illustrations and part numbers, assembly and disassembly procedures, and cross-referencing for part number changes, ensuring accurate maintenance and repair.