Welcome to the comprehensive workshop service and repair manual for the A4, B6 generation, specifically covering the 2004 model year. This vehicle represents a commitment to engineering excellence, offering a blend of sophisticated design, refined performance, and premium interior appointments. Known for its sharp styling, advanced technology, and engaging driving dynamics, particularly with the available all-wheel-drive system, the A4 is a distinguished choice in the compact executive segment. Whether equipped with the efficient 1.8T, the capable 2.0 FSI, or the powerful 3.0 V6 engine, the A4 delivers a driving experience that balances comfort with sporty responsiveness, making it a popular option for discerning drivers.

This manual provides detailed, authoritative guidance for maintaining and repairing your A4. It covers a wide array of systems, including engine mechanicals, engine management, transmissions (manual and automatic), drivetrain, suspension, steering, brakes, and the complete electrical system. You will find in-depth procedures for routine maintenance, component replacement, troubleshooting, and diagnostics, supported by essential technical specifications, torque values, and comprehensive wiring diagrams. This resource is designed to empower owners, technicians, and mechanics with the knowledge required to ensure the optimal performance, reliability, and longevity of the A4.