The Audi 90, produced between 1988 and 1992, represents a premium compact executive vehicle known for its sleek, aerodynamic design and sophisticated styling. As a more luxurious and performance-oriented variant of the Audi 80, it offered a refined driving experience, emphasizing driver engagement and performance. Notable features include the availability of the legendary Audi Quattro all-wheel drive system, a testament to Audi's engineering prowess. This model, built on the Type 85 chassis, was a strong contender in its segment, recognized for its build quality and technological advancements.

This comprehensive factory service manual provides detailed instructions for the service, repair, and maintenance of all Audi 90 models from 1988-1992, covering all available trim levels. With over 1500 pages of information, it delves into every major system, including engine mechanicals, fuel and ignition systems, transmissions (manual, automatic, and Quattro), brakes, suspension, steering, and the complete electrical system. The manual includes scheduled maintenance procedures, step-by-step repair instructions, diagnostic guides, and detailed technical specifications, complete with wiring diagrams and torque values, ensuring owners and technicians have the resources needed to maintain the vehicle's integrity and performance.