This comprehensive service and repair manual provides detailed instructions for maintaining and repairing your 1999 Audi A4, S4, RS4 Avant, and Allroad models. This manual covers all variants including the 8D, 8D2, and 8D5 models. The manual is organized into sections covering every aspect of your vehicle, from basic maintenance to complex repairs, ensuring that you have the information you need to keep your Audi running smoothly. Dive into the intricacies of your Audi with sections dedicated to: * **General Information:** Gain a comprehensive understanding of your vehicle's specifications, features, and important safety procedures. * **Accessories & Equipment:** Find detailed information about the installation and operation of various accessories and equipment. * **Audio, Visual & Telematics:** Master the workings of your Audi's audio, visual, and telematics systems, including troubleshooting and repair instructions. * **Brakes:** Learn about the brake system components, maintenance procedures, and troubleshooting steps for common brake issues. * **Driveline Axle:** Gain expertise on the intricacies of your Audi's driveline and axle components, enabling you to diagnose and resolve potential problems. * **Electrical:** This section provides a deep dive into the electrical system, covering components, wiring diagrams, and troubleshooting advice for electrical malfunctions. * **Lights:** Understand the operation and maintenance of your Audi's lighting system, including troubleshooting and repair instructions. * **Restraints:** Get detailed information on the restraint system, including seatbelts, airbags, and their maintenance. * **Steering:** Learn about the steering system's components, maintenance procedures, and troubleshooting techniques to ensure safe and reliable steering. * **Suspension:** This section provides a guide to your Audi's suspension system, covering components, adjustments, and troubleshooting. * **Body & Frame - Interior & Exterior:** Explore the body and frame construction, interior and exterior components, and repair procedures for various body and frame issues. * **Mechanical Engine:** Delve into the workings of your Audi's engine, including detailed descriptions of components, maintenance schedules, and troubleshooting guides for engine problems. * **Transmission:** This section covers the transmission system, providing information on components, operation, maintenance, and troubleshooting. * **Tire & Wheels:** Learn about tire and wheel specifications, maintenance procedures, and tire replacement guidelines. * **HVAC:** Find detailed information on the Heating, Ventilation, and Air Conditioning (HVAC) system, including its components, operation, and maintenance. * **Wiring Diagrams:** This essential section provides comprehensive wiring diagrams for your Audi, helping you understand the electrical flow and troubleshoot electrical issues. This comprehensive manual is an invaluable resource for anyone who wants to understand, maintain, and repair their Audi A4. It provides a wealth of information and guidance, enabling you to tackle a wide range of issues with confidence.

The Audi A4, a compact executive car produced by the German automaker Audi since 1994, has undergone several iterations throughout its production history. The 1999 model year, representing the second generation of the A4 (internally designated as the 8D platform), witnessed the introduction of several performance-oriented variants, including the S4, RS4, Avant, and Allroad. The S4, boasting a 2.7-liter twin-turbocharged V6 engine generating 250 hp, offered a sporty driving experience. The RS4, a high-performance version, was powered by a 2.7-liter twin-turbocharged V6 producing 380 hp, making it a formidable contender on the track. The Avant, a station wagon body style, provided a practical and spacious interior while maintaining the A4's sleek design. Completing the lineup was the Allroad, a versatile off-roader equipped with a raised suspension and all-wheel drive, offering a balance between on-road performance and off-road capability. All models within the 8D generation A4 benefitted from Audi's renowned quattro all-wheel drive system, ensuring superior traction and handling, particularly in challenging conditions.