The Audi 90, produced from 1988 through 1992, represented Audi's premium compact executive sedan offering, known for its sophisticated engineering and the distinct character of its 2.3-liter inline 5-cylinder engine. This model, available in sedan body styles and featuring both front-wheel drive and the renowned Quattro all-wheel-drive system, competed with established luxury brands by providing a blend of performance, comfort, and advanced technology for its era. Its design emphasized driver engagement and build quality, reflecting Audi's heritage in creating durable and refined automobiles.

This comprehensive Factory Service Manual provides detailed guidance for the maintenance, repair, and diagnostics of the Audi 90 (Type 85/8C) across its covered production years. It covers all major systems, including the powertrain, drivetrain, chassis, electrical components, and body. Within its extensive pages, you will find routine maintenance procedures, in-depth troubleshooting steps, diagnostic flowcharts, technical specifications, and crucial safety guidelines. This manual is an essential resource for owners, mechanics, and technicians aiming to preserve the integrity and performance of their Audi 90.