This manual covers the 1998 Audi A4, platform code B5, available in North America and Europe. This compact executive sedan and Avant (wagon) is known for its sophisticated engineering, refined interiors, and the availability of the legendary quattro all-wheel-drive system. Offered with either a 1.8L turbocharged inline-4 engine (AWM, APU, ALT, AMB) or a 2.8L V6 30v engine (ACK, ALG, AMX, APR, AQD, ATQ), the A4 (B5) provided a blend of performance and luxury, often recognized by publications like Car and Driver as one of the '10Best' vehicles for its segment. Its solid chassis and multi-link rear suspension contributed to its reputation for excellent handling and ride quality.

This comprehensive factory service manual provides detailed information for the maintenance, repair, and diagnostics of the 1998 Audi A4 (B5) sedan (8D2) and Avant (8D5) models, including both front-wheel drive and quattro all-wheel drive variants. It covers all major systems, including powertrain, transmission, drivetrain, suspension, steering, brakes, electrical, HVAC, body, and safety systems. Within its extensive pages, you will find step-by-step procedures for scheduled maintenance, component removal and installation, overhaul instructions, troubleshooting guides, diagnostic procedures, and essential technical specifications and tolerances. This manual is an indispensable resource for owners, mechanics, and technicians aiming to maintain the integrity and performance of their Audi A4.