🏷️ Basic Information Identification Make: Audi Model: 100 Model Code: C4 Year: 1993 👋 Introduction Market Position Market Position: The Audi 100 (C4) represented Audi's upscale sedan offering in the early 1990s, competing against established luxury marques from Germany and the United States. It was positioned as a premium, front-wheel-drive or all-wheel-drive (Quattro) vehicle known for its build quality, sophisticated design, and comfort. Competitive Analysis Competitive Analysis: Competitors included models like the Mercedes-Benz W124 E-Class, BMW 5 Series (E34), and Volvo 900 series. The Audi 100 distinguished itself with its advanced Quattro all-wheel-drive system, aerodynamic styling, and a focus on safety and build integrity. Key Features Key Features: Profoundly robust engineering, Quattro all-wheel-drive availability, refined interior, excellent safety features for its era, aerodynamic profile, and a reputation for long-term durability when properly maintained. 📋 Manual Details Coverage Areas Coverage Areas: Full Service, Repair, Maintenance, Diagnostics, Electrical Schematics, Bodywork, Troubleshooting Page Count Page Count: Estimated 1000+ pages (typical for comprehensive workshop manuals of this era) Manual Type Manual Type: Workshop Service and Repair Manual Language Language: English Format Format: PDF (Digital Download) 📖 Manual Coverage Systems Covered Systems Covered: Engine Mechanical, Engine Management (ECU), Fuel System, Ignition System, Cooling System, Lubrication System, Exhaust System, Drivetrain (FWD/Quattro AWD), Manual and Automatic Transmissions, Clutch, Suspension (Front & Rear), Steering System, Braking System (ABS), Air Conditioning System, Heating System, Electrical System (Wiring Diagrams, Components), Body & Chassis, Interior Trim, Exterior Trim, Diagnostic Procedures Procedures Included Procedures Included: Routine Maintenance (Oil Changes, Filter Replacement, Spark Plugs), Tune-up Procedures, Engine Rebuilds, Transmission Overhauls, Brake Service (Pads, Rotors, Calipers), Suspension Component Replacement (Shocks, Struts, Bushings), Steering System Repairs, Electrical Troubleshooting and Component Replacement, Diagnostic Fault Code Interpretation, Body Panel Alignment and Repair, Air Conditioning Servicing, Body Electrical and Lighting Diagnostics, Interior Component Repair Technical Depth Technical Depth: Comprehensive, including detailed step-by-step repair instructions, exploded views, torque specifications, diagnostic flowcharts, wiring diagrams, and component identification. Electrical Schematics Electrical Schematics Depth: Detailed wiring diagrams for all major systems, including engine management, lighting, power windows, central locking, ABS, and instrumentation. Troubleshooting Troubleshooting Guides: Diagnostic flowcharts and symptom-based troubleshooting procedures for common and uncommon problems across all vehicle systems. Bodywork Bodywork Repair: Information on body panel removal and installation, door mechanisms, glass replacement, and basic collision repair considerations. Torque Specifications Torque Specifications Detail: Comprehensive list of torque values for all critical fasteners, essential for proper assembly and safety. Diagnostic Tools Diagnostic Tool Requirements: Information on the use of factory diagnostic tools or equivalent aftermarket scan tools for accessing engine control unit (ECU) data and fault codes (e.g., OBDI data retrieval). 📊 Manual Specifications File Format File Format: PDF Print Quality Print Quality: High-resolution scans, suitable for printing high-quality pages. Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Primary Engine: 2.8L 12-Valve SOHC V6 (AAH engine code) Performance Horsepower Hp: 172 hp @ 5500 rpm Torque Lb Ft: 184 lb-ft @ 3000 rpm Fuel System Fuel System: Bosch Motronic Electronic Fuel Injection (EFI) Engine Codes Covered Engine Codes Covered: AAH (2.8L V6). May also include details for other 4-cylinder variants if applicable to the 1993 model year range of the C4 platform (e.g., AAR 2.3L 5-cylinder). Engine Cooling Cooling System Type: Pressurized Liquid Cooling System Engine Lubrication Oil Capacity Quarts: Approx. 5.0 US quarts (4.7 liters) with filter change (for 2.8L V6) Recommended Oil Viscosity: 5W-30 or 5W-40 (API SG/SH or higher) 🔧 Transmission Standard Transmission Standard: 5-speed Manual Transmission Optional Transmission Optional: 4-speed Automatic Transmission (Tiptronic optional in later C4 models, but standard automatic is common for '93) Features All Wheel Drive: Audi Quattro All-Wheel Drive System (Optional) Fluid Specifications Auto Automatic Transmission Fluid: G 052 162 A1 (or equivalent DEXRON III/MERCON) Fluid Specifications Manual Manual Transmission Fluid: G 052 171 A2 (or equivalent API GL-4 SAE 75W-90) 📐 Dimensions Exterior Length In: 190.9 inches Width In: 70.5 inches Height In: 57.1 inches Weights Curb Weight Lbs: Approx. 3,300 - 3,600 lbs (depending on drivetrain and equipment) Gross Vehicle Weight Rating Gvwr Lbs: Approx. 4,500 - 4,800 lbs Cargo Trunk Volume Cu Ft: Approx. 15.0 - 16.0 cu ft 🛡️ Safety Features Ratings NHTSA Frontal Crash Rating: Not explicitly rated by NHTSA in the modern standardized way, but known for robust safety cage and early adoption of safety features. Active Features Active Safety Features: Anti-lock Braking System (ABS), Quattro All-Wheel Drive (optional, enhances traction) Passive Features Passive Safety Features: Driver and front passenger airbags, reinforced safety cage construction, front and rear crumple zones, side-impact protection beams, three-point seatbelts with pretensioners. Lighting Headlight Type: Halogen, often with aerodynamic composite lenses. 💡 Technology Features Infotainment Infotainment System: Factory AM/FM stereo with cassette player, optional CD player. Speaker systems varied by trim level. Driver Assistance Driver Assistance Features: Cruise control, power steering, Anti-lock...