This comprehensive service and repair manual covers the Audi A8, S8, and A8L models produced in 1999. It is a complete and official factory-level manual that provides detailed information and instructions for all aspects of your vehicle's maintenance and repair. The manual includes detailed instructions and diagrams for:

**General Information:** This section lays the foundation for understanding your Audi, including safety precautions, general information about the vehicle, and explanations of common tools and procedures.

**Accessories & Equipment:** Explore the details of each optional accessory or equipment available for your Audi, ensuring you understand the specifications and installation processes.

**Audio, Visual & Telematics:** Dive into the nuances of your Audi's audio system, navigation system, and telematics system, discovering how to operate, troubleshoot, and repair these components.

**Brakes:** Gain a thorough understanding of your Audi's braking system, including the components, functions, diagnosis, and repair procedures for the brakes.

**Driveline Axle:** Explore the intricacies of your Audi's drivetrain and axles, learning about their functions, operation, and troubleshooting methods.

**Electrical System:** Discover the intricacies of your Audi's electrical system, from basic circuits to complex components like the ECU (Engine Control Unit).

**Lights:** Learn about all aspects of the lighting system on your Audi, including headlights, taillights, indicators, and interior illumination. Find information on troubleshooting, maintenance, and repair.

**Restraints:** Thoroughly understand your Audi's safety systems, including airbags, seatbelts, and other restraint systems. This section covers proper operation, maintenance, and repair procedures.

**Steering:** Explore how your Audi's steering system works, including the components, steering mechanisms, and power steering systems. Understand proper maintenance and repair procedures.

**Suspension:** Delve into the suspension system of your Audi, learning about the components, functions, and troubleshooting methods for a smoother ride.

**Body & Frame:** Get detailed information on the body and frame of your Audi, covering the exterior panels, interior components, and structural elements. This section includes information on repair and customization.

**Mechanical Engine:** This section provides a complete understanding of your Audi's engine, covering all components, including the timing system, fuel system, and cooling system. Thorough insights are provided into engine repair and maintenance.

**Transmission:** Learn about the functionality and operation of your Audi's transmission, covering both manual and automatic transmissions. Understand how to diagnose and address transmission issues.

**Tire & Wheels:** Get detailed information about your Audi’s tires and wheels, including proper selection, maintenance, and repair instructions.

**HVAC:** Understand the inner workings of your Audi's heating, ventilation, and air conditioning (HVAC) system. Learn how to operate, troubleshoot, and repair this vital component.

**Wiring Diagrams:** This crucial section provides detailed wiring diagrams for the entire vehicle, allowing you to trace electrical circuits, identify components, and understand their connections.

This manual offers a comprehensive guide for understanding and maintaining your Audi A8, S8, or A8L. Whether you're a seasoned mechanic or a dedicated DIY enthusiast, this manual is an invaluable resource for keeping your Audi in top condition.

The Audi A8, S8, and A8L, launched in 1999, represented a significant leap forward for the German automaker. They were the first generation of the A8 model line, showcasing a commitment to luxury and innovation that would redefine Audi's image. Built upon the Volkswagen Group's D2 platform, these sedans sported sleek, aerodynamic designs, boasting a spacious interior with cutting-edge technology. The A8, available in standard and long-wheelbase (A8L) versions, offered a range of powerful V6 and V8 engines, while the performance-oriented S8 embraced a high-revving, naturally aspirated V8, pushing the boundaries of luxury driving. The interior was a testament to German engineering, featuring premium materials, advanced ergonomics, and the introduction of the groundbreaking Multi Media Interface (MMI) system, a precursor to today's infotainment systems. The A8's technological innovations extended beyond the cabin, incorporating innovative features such as adaptive air suspension, quattro all-wheel drive, and the first implementation of the 'Audi Space Frame' (ASF) aluminum-intensive construction, contributing to its lightweight design and improved handling.

Although the design was praised for its sophistication and refinement, the first-generation A8 was not without its challenges. Initial issues with the air suspension system and occasional electrical glitches impacted reliability. However, Audi addressed these concerns through ongoing updates and improvements. The 1999 A8, despite its early hurdles, established the foundation for the A8's reputation as a benchmark in the luxury sedan segment. It introduced a new level of technological advancement and refined driving experience that solidified Audi's position as a frontrunner in the automotive industry. Though its design and capabilities have evolved since, the 1999 A8 remains a significant milestone in Audi's history, showcasing the brand's commitment to engineering excellence and innovation.