🏷️ Basic Information Identification Make: Audi Model: A6 Year: 2004 Codes Chassis Code: C6 / 4F 👋 Introduction Market Position Segment: Executive Sedan / Luxury Mid-size Sedan Positioning: Premium, comfort-oriented, technologically advanced luxury vehicle positioned against competitors like BMW 5 Series, Mercedes-Benz E-Class, and Lexus GS. Competitive Analysis Key Competitors: BMW 5 Series (E60), Mercedes-Benz E-Class (W211), Lexus GS (S190), Jaguar S-Type, Volvo S80. Key Features Design Philosophy: The C6 A6 represented Audi's design language evolution, emphasizing clean lines, a prominent Singleframe grille, and advanced lighting technology. Platform Technology: Built on the Volkswagen Group's MLB platform (Modular Longitudinal Matrix), featuring a longitudinal engine layout and available Quattro all-wheel drive. 📋 Manual Details Coverage Areas Coverage Scope: All models and all repairs A-Z Page Count Estimated Page Count: Varies by specific engine/drivetrain variant, typically 1500+ pages for complete dealer-level documentation. Manual Type Type: Service and Repair Manual Language Language: English Format Format: Digital (likely PDF, searchable) 📖 Manual Coverage Systems Covered Engine Systems: Engine mechanical, fuel injection, ignition, cooling, lubrication, exhaust, emissions control, engine management systems (ECU/ECM). Transmission Drivetrain: Manual transmission, automatic transmission (Tiptronic), Quattro all-wheel drive system, differentials, drive shafts, CV joints. Brakes Suspension: Brake system (hydraulic, ABS, ESP/ESC), suspension components (front and rear), steering system, wheel alignment. Electrical Electronics: Battery, charging system, starter, lighting, instrument cluster, body control modules (BCM), comfort electronics, infotainment, navigation, ADAS sensors. Body Chassis: Body panels, doors, interior trim, glass, sunroof, HVAC system, heating, ventilation, air conditioning (A/C), chassis components, body repair. Procedures Included Maintenance: Scheduled maintenance intervals, oil changes, filter replacements, fluid checks and top-offs, belt inspection/replacement, spark plug replacement. Diagnostics Troubleshooting: Diagnostic trouble codes (DTCs) interpretation, symptom-based troubleshooting, component testing, wiring diagrams for diagnosis. Repair Overhaul: Engine rebuild procedures, transmission overhaul, brake component replacement, suspension rebuild, electrical component replacement, body panel repair. Calibration Programming: Component replacement procedures requiring calibration or programming (e.g., ABS sensors, ECU, airbags, steering angle sensors). Technical Depth Depth: Dealer-level comprehensive diagnostic and repair procedures, including torque specifications, component clearances, and specialized tool requirements. 📊 Manual Specifications File Format File Type: PDF (Portable Document Format) Searchability: Fully searchable text for quick information retrieval. Print Quality Resolution: High-resolution images, diagrams, and schematics for clarity. Printability: Printable pages for on-site workshop use. Binding Type Binding: N/A (Digital Format) Paper Type Paper: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Code Common: 2.4 V6 (BDW), 3.0 V6 TFSI (CAPA - later models but some variants may exist), 3.2 V6 FSI (AUK, BKH), 4.2 V8 FSI (BAR). Diesel: 2.0 TDI (BPW), 2.7 TDI (BPP), 3.0 TDI (BKN, ASB). Performance Horsepower Range: 177 hp (2.0 TDI) to 350 hp (4.2 V8 FSI). Torque Range: 250 Nm (2.0 TDI) to 440 Nm (4.2 V8 FSI). Fuel System Injection Type Gasoline: Multi-point fuel injection (MPI) or Direct Fuel Injection (FSI). Injection Type Diesel: Common Rail Direct Injection (CRDI). Engine Management ECU Type Examples: Bosch Motronic, Siemens VDO. 🔧 Transmission Standard Manual Transmission: 6-speed manual (e.g., GFU for 2.4L). Optional Automatic Transmission: 6-speed Tiptronic automatic (e.g., 09L for FWD, 09E for Quattro). Features Drivetrain Options: Front-wheel drive (FWD) and Audi's Quattro permanent all-wheel drive. Fluid Specifications Atf Type: G 055 025, G 055 540 (for specific 6-speed automatics). 📐 Dimensions Exterior Length: Approx. 4,916 mm (193.5 in) Width: Approx. 1,855 mm (73.0 in) Height: Approx. 1,455 mm (57.3 in) Wheelbase: Approx. 2,843 mm (111.9 in) Weights Curb Weight Range: Approx. 1,550 kg (3,417 lbs) to 1,800 kg (3,968 lbs) depending on engine and configuration. 🛡️ Safety Features Ratings NHTSA Front Crash Test: 5-Star rating (for 2005 model year, highly indicative for 2004). IIHS Side Crash Test: Good rating (for 2005 model year, highly indicative for 2004). Active Features Electronic Stability Control: Standard ESP (Electronic Stability Program), often with Brake Assist and Traction Control. Braking System: 4-wheel Anti-lock Braking System (ABS) with Electronic Brake-force Distribution (EBD) and optional Ceramic Brakes on high-performance variants. Passive Features Airbags: Front airbags, side airbags, optional front and rear side curtain airbags (Sideguard). Seatbelts: Three-point inertia-reel seat belts with pre-tensioners and force limiters, active head restraints. 💡 Technology Features Infotainment Infotainment System: MMI (Multi Media Interface) system, offering navigation, audio, climate control, and vehicle settings through a central control knob and buttons. Driver Assistance Adaptive Cruise Control: Optional Adaptive Cruise Control (ACC) system available on some models. Parking Sensors: Optional front and rear parking sensors (Audi parking system). Connectivity Phone Integration: Optional Bluetooth preparation for mobile phones. Lighting Headlights: Bi-Xenon headlights with LED daytime running lights (DRLs) were optional or standard on higher trims, representing a significant technological advancement. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 10,000 miles or 12 months, depending on driving conditions and oil specification (LongLife service may extend this). Spark Plug Replacement: Varies by engine: e.g., 60,000 miles for standard plugs, potentially longer for iridium or platinum...