🏷️ Basic Information Identification Make: Audi Model: A6 Year: 2004 Generation Chassis Code: C5-4B Codes Product Code Identifier: 2004 Audi A6 (C5-4B) Service and Repair Manual 👋 Introduction Market Position Segment: Executive/Luxury Sedan and Avant (Wagon) Competitive Analysis Key Competitors: BMW 5 Series, Mercedes-Benz E-Class, Lexus GS, Jaguar S-Type, Cadillac CTS Key Features Premium Appointments: High-quality interior materials, advanced comfort features, sophisticated styling Performance Options: Powerful V6 and V8 engines, available Quattro all-wheel drive, refined driving dynamics Design Philosophy: Understated elegance, aerodynamic efficiency, characteristic Audi 'singleframe' grille predecessor 📋 Manual Details Coverage Areas Full Vehicle Coverage: All models and all repairs A-Z Page Count Estimated Page Count: Extensive (typically 1000+ pages for this level of detail) Manual Type Type: Service and Repair Manual Language Language: English Format Format: Digital (likely PDF, potentially printable) 📖 Manual Coverage Systems Covered Powertrain: Engine mechanical, engine management (ECU), fuel system, ignition system, exhaust system, cooling system, lubrication system, turbocharging/supercharging (if applicable) Transmission: Manual and Automatic transmission service, repair, diagnostics, and fluid specifications Drivetrain: Front-wheel drive (FWD) and Quattro all-wheel drive (AWD) systems, axles, differentials, driveshafts, CV joints Suspension And Steering: Front and rear suspension components, shock absorbers, springs, control arms, steering rack, power steering system Brakes: Brake system components (discs, pads, calipers), ABS, EBD, brake fluid specifications, bleeding procedures Electrical System: Battery, alternator, starter, lighting, wiring diagrams, fuses, relays, body control module (BCM), comfort systems Body And Chassis: Body panels, doors, windows, locks, interior trim, frame and chassis components, exterior trim HVAC: Heating, Ventilation, and Air Conditioning (HVAC) system diagnosis and repair Diagnostics: On-Board Diagnostics (OBD-II) system, diagnostic trouble codes (DTCs), troubleshooting procedures Procedures Included Routine Maintenance: Oil changes, filter replacements, fluid level checks and top-offs, spark plug replacement, belt inspection and replacement Major Repairs: Engine rebuilds, transmission overhauls, suspension component replacement, brake system repairs, electrical component troubleshooting and replacement Troubleshooting: Systematic diagnostic procedures for common and uncommon faults, fault code interpretation Specifications And Tolerances: Torque specifications, clearances, fluid capacities, electrical resistance values Wiring Diagrams: Detailed electrical schematic diagrams for all vehicle systems Technical Depth Depth: Comprehensive, dealer-level technical information for professional technicians and advanced DIY enthusiasts 📊 Manual Specifications File Format Digital Format: Likely PDF, enabling search functionality and easy access to specific sections Print Quality Printability: High-quality, printable pages suitable for workshop use Binding Type Physical Binding: N/A (Digital format) Paper Type Physical Paper: N/A (Digital format) ⚙️ Engine Specifications Primary Engine Engine Variants Covered: 2.7L V6 Biturbo (APlus engine code), 3.0L V6 (ASN, BBK engine codes), 4.2L V8 (BGH engine code) Performance Horsepower Range: Approximately 255 hp (2.7T) to 300 hp (4.2 V8) Torque Range: Approximately 295 lb-ft (2.7T) to 317 lb-ft (4.2 V8) Fuel System Fuel Delivery: Multi-Point Fuel Injection (MPI) or Fuel Stratified Injection (FSI) depending on engine variant Engine Management ECU Type: Bosch Motronic or Simos engine control units Engine Construction Block Material: Aluminum Alloy Timing System Timing Mechanism: Timing belt (3.0 V6) or timing chain (2.7T V6, 4.2 V8) 🔧 Transmission Standard Standard Transmission Type: 5-speed Tiptronic automatic transmission (01V/01A) Optional Optional Transmission Type: 6-speed manual transmission (GDU, GDU for Quattro models) Features All Wheel Drive System: Torsen center differential based Quattro AWD system Fluid Specifications Automatic Transmission Fluid: G 055 025 (for 01V/01A) Manual Transmission Fluid Manual Transmission Fluid Spec: G 052 171 (for 6-speed manual) 📐 Dimensions Exterior Sedan Length: Approx. 191.7 inches (4869 mm) Avant Length: Approx. 190.9 inches (4850 mm) Width: Approx. 71.7 inches (1821 mm) Height: Approx. 56.7 inches (1440 mm) Interior Wheelbase: Approx. 109.5 inches (2783 mm) Cargo Sedan Cargo Volume: Approx. 15.1 cubic feet (428 liters) Avant Cargo Volume: Approx. 18.8 - 57.9 cubic feet (532 - 1639 liters) with rear seats up/down Weights Curb Weight: Approx. 3600 - 4100 lbs (1633 - 1860 kg) depending on configuration Gross Vehicle Weight Rating: Approx. 4700 - 5100 lbs (2132 - 2313 kg) 🛡️ Safety Features Ratings NHTSA Front Impact: 5 Stars (for 2004 model year) NHTSA Side Impact: 4 Stars (for 2004 model year) Active Features ABS: Standard Anti-lock Braking System (ABS) Esp: Optional Electronic Stability Program (ESP), also known as Electronic Stabilization Control (ESC) Traction Control: Standard Traction Control System (ASR) Passive Features Airbags: Standard front airbags, optional side airbags, optional curtain airbags (Sideguard) Seatbelts: 3-point inertia-reel seatbelts with pretensioners and load limiters Child Seat Anchors: ISOFIX/LATCH system 💡 Technology Features Infotainment Navigation System: Optional Audi Navigation System (RNS-D, RNS-E depending on trim/options) Audio System: Bose premium sound system optional on higher trims Driver Assistance Parking Sensors: Optional Audi Parking System (front and rear sensors) Cruise Control: Standard cruise control Connectivity Hands Free Calling: Optional Bluetooth preparation/hands-free system Lighting Headlights: Halogen projector headlights, Xenon headlights with adaptive lighting optional on some trims. 🔧 Maintenance Service Intervals Oil Change Interval: Typically 5,000-7,500 miles or 12 months, depending on driving conditions and...