This comprehensive Audi A6 Factory Service Workshop Manual is an essential resource for anyone looking to perform repairs and maintenance on their 1998-2004 Audi A6. It provides detailed instructions and diagrams covering every aspect of the vehicle, from routine maintenance like oil changes to complex repairs like transmission rebuilds. The manual is organized in a logical and user-friendly manner, making it easy to find the information you need. It includes information on a wide range of systems, including: * **Engine Mechanical System:** Covers everything from engine components like pistons and camshafts to the timing belt and cooling system. * **Engine Electrical System:** Provides detailed information on the ignition system, fuel injectors, sensors, and wiring diagrams. * **Emission Control System:** Explains the operation and maintenance of the catalytic converter, exhaust gas recirculation system, and other emission control components. * **Fuel System:** Covers fuel pumps, fuel lines, fuel filters, and fuel injectors. * **Clutch System:** Provides detailed information on the clutch hydraulics, clutch disc, pressure plate, and release bearing. * **Automatic/Manual Transaxle System:** Covers the operation and maintenance of the transmission, including gear ratios, shift patterns, and troubleshooting procedures. * **Driveshaft and Axle:** Covers the driveshaft, axles, and wheel bearings. * **4WD System:** Details the operation and maintenance of the quattro all-wheel drive system. * **Suspension System:** Covers shocks, struts, springs, stabilizer bars, and other suspension components. * **Steering System:** Provides information on the steering rack, steering column, power steering system, and steering linkage. * **Restraint System:** Covers the airbags, seatbelts, and other safety systems. * **Brake System:** Covers the brake calipers, brake pads, rotors, and hydraulic system. * **Body (Interior and Exterior):** Includes information on the body panels, interior trim, and exterior features. * **Body Electrical System:** Provides details on the wiring diagrams, electrical components, and troubleshooting procedures. * **Heating, Ventilation, Air Conditioning:** Covers the HVAC system, including the blower motor, heater core, and air conditioning compressor. This manual is an invaluable tool for both professional mechanics and knowledgeable DIY enthusiasts. With its comprehensive coverage and detailed instructions, it empowers you to confidently diagnose and repair any issue on your Audi A6.

The Audi A6 (C4) is a mid-size luxury sedan produced by Audi from 1997 to 2004. It was the successor to the Audi 100 and bridged the gap between the compact Audi A4 and the flagship Audi A8. The C4 A6 was available with a wide range of engine options, including gasoline and diesel engines, ranging from a 1.8L 4-cylinder to a 4.2L V8. Transmission choices included a 5-speed manual, a 5-speed automatic, and a 6-speed manual. The A6 was praised for its refined driving experience, spacious cabin, and well-appointed interior. It was also known for its robust build quality and reliability, solidifying Audi's reputation as a manufacturer of premium automobiles. The Audi A6 (C4) featured a number of innovative features for its time. Its quattro all-wheel drive system, available on many variants, enhanced traction and stability. The A6 was also one of the first cars in its segment to offer optional xenon headlights, providing superior illumination at night. On the interior, the A6 boasted ergonomic design and high-quality materials, including leather upholstery and wood trim. It also came equipped with advanced comfort and convenience amenities, like automatic climate control, power seats, and numerous safety features. The Audi A6 (C4) solidified Audi's position as a leader in the luxury car market. It offered a blend of performance, comfort, and technology that appealed to discerning drivers, making it a popular choice for both daily commuting and long-distance travel.