This manual covers the Audi 100, model code C4-4A, produced during the C4 generation from 1991 to 1994. Known for its sophisticated design, strong build quality, and advanced engineering, the Audi 100 served as an executive sedan and wagon, competing with luxury marques like BMW and Mercedes-Benz. Key features include its aerodynamic styling, spacious interior, refined ride quality, and the highly regarded optional Quattro all-wheel-drive system, which provided exceptional traction. The vehicle was equipped with a 2.8L SOHC V6 engine, available with either a 5-speed manual or a 4-speed automatic transmission, and offered a range of technologies including standard cruise control and an optional ABS system. This comprehensive factory service manual provides in-depth coverage for all models and trims of the Audi 100 (C4). It details a vast array of maintenance procedures, from routine oil changes and timing belt replacements to complete engine and transmission overhauls. The manual also includes extensive troubleshooting guides, diagnostic procedures for various systems including engine performance, brakes, and electrical components, as well as detailed technical specifications, torque values, and fluid requirements. This resource is designed to assist owners, mechanics, and technicians in maintaining, diagnosing, and repairing the Audi 100 with accuracy and efficiency. 🏷️ Basic Information Identification Make: Audi Model: 100 Model Code: C4-4A Year: 1992 Generation Generation Code: C4 Generation Years: 1991-1994 👋 Introduction Market Position Market Segment: Executive Sedan/Wagon Premium Features: Known for its sophisticated design, strong build quality, and advanced engineering for its era. Competitive Analysis Key Competitors: BMW 5 Series, Mercedes-Benz E-Class, Volvo 900 Series, Lexus ES. Key Features Design Philosophy: Aerodynamic styling, spacious interior, and refined ride quality characteristic of Audi's mid-luxury offerings. All Wheel Drive: Optional and highly regarded Quattro all-wheel-drive system providing exceptional traction and handling. 📋 Manual Details Coverage Areas All Models And Trims: Yes Repair Scope: A-Z (All Repairs) Page Count Estimated Page Count: 1500+ Manual Type Manual Type: Factory Service Manual / Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Mechanical: Complete overhaul, diagnostics, timing belt replacement, lubrication system, cooling system. Engine Performance: Fuel injection system (KE-Jetronic/LH-Jetronic), ignition system, emission control systems. Transmission: Manual and Automatic transmission overhaul, diagnostics, fluid specifications, shift linkage adjustment. Drivetrain: Front-wheel drive and Quattro all-wheel drive systems, differential, CV joints, driveshafts. Brakes: Hydraulic system, ABS (Anti-lock Braking System), disc and drum brake servicing, bleeding procedures. Suspension: Front and rear suspension components, alignment specifications, shock absorber replacement, control arm servicing. Steering: Power steering system, steering rack and pump servicing, tie rod ends. Electrical System: Wiring diagrams, component testing, alternator, starter motor, battery, fuses, relays. Body And Chassis: Body panel removal and installation, door mechanisms, glass replacement, chassis lubrication, rust prevention. HVAC: Heating, ventilation, and air conditioning (HVAC) system servicing, refrigerant handling, component replacement. Procedures Included Routine Maintenance: Oil changes, filter replacements, spark plug replacement, fluid checks and top-offs, belt inspection. Troubleshooting: Diagnostic flowcharts, symptom-based troubleshooting for engine, electrical, and mechanical issues. Repair And Rebuild: Step-by-step instructions for component repair, overhaul, and replacement of major and minor parts. Diagnostics: OBD-I (On-Board Diagnostics) procedures, fault code retrieval, sensor testing, actuator testing. Adjustment: Valve adjustment, timing belt tension, idle speed adjustment, clutch adjustment. Installation: Component installation procedures, accessory fitting, timing belt installation. Technical Depth Depth Of Information: Comprehensive; covers everything from basic maintenance to full engine and transmission rebuilds. Diagnostic Capabilities: Advanced diagnostic procedures, including electronic system analysis and mechanical testing. Specification Detail: Includes detailed torque specifications, clearances, fluid capacities, and electrical values. 📊 Manual Specifications File Format File Format: Searchable PDF Print Quality: High-resolution, suitable for printing individual pages or the entire manual. Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Code: AAF (2.8L V6) Engine Type: 2.8L SOHC V6 (12 Valve) Displacement: 2771 cc Bore X Stroke: 82.5 mm x 91.3 mm Compression Ratio: 10.3:1 Performance Horsepower: 172 hp @ 5500 rpm Torque: 184 lb-ft @ 3200 rpm Fuel System Fuel Delivery: Bosch KE-Jetronic or LH-Jetronic Fuel Injection Fuel Type: Unleaded Gasoline (91 Octane Recommended) Other Engines Engine Options: 2.3L 5-cylinder (NG), 2.6L 5-cylinder (ABC) - Coverage may vary depending on specific manual edition. 🔧 Transmission Standard Standard Transmission: 5-speed Manual Optional Optional Transmission: 4-speed Automatic (ZF 4HP22) Features Drivetrain Options: Front-Wheel Drive (FWD) or Quattro All-Wheel Drive (AWD) 📐 Dimensions Exterior Length: 4.81 m (189.4 in) Width: 1.77 m (69.7 in) Height: 1.43 m (56.3 in) Wheelbase: 2.76 m (108.7 in) Weights Curb Weight: 1550-1650 kg (3417-3638 lbs) approx. 🛡️ Safety Features Ratings NHTSA Ratings: Not widely available for this model year, but generally considered safe for its time. Active Features ABS: Standard on most models, optional on base trims. Passive Features Airbags: Driver's side airbag standard on most models. Seatbelts: Three-point inertia-reel seatbelts front and rear. 💡 Technology Features Infotainment Audio...