🏷️ Basic Information Identification Make: Audi Model: A4 S4 Production Years Covered: 2003, 2004, 2005, 2006 Generation Chassis Code: B6 (8E/8H) 👋 Introduction Market Position Segment: Premium Compact Executive Sedan/Wagon Competitive Analysis Key Competitors: BMW 3 Series, Mercedes-Benz C-Class, Lexus IS Key Features Audi Drive Select: Not applicable for these model years; Quattro AWD was a hallmark Quattro AWD: Standard on S4, optional on A4 variants (depending on engine) Design Philosophy: Elegant, understated styling with a focus on quality and driver engagement 📋 Manual Details Coverage Areas Primary Coverage: Parts and component identification for Audi A4 and S4 models Secondary Coverage: Component illustrations, part numbers, and assembly diagrams Page Count Estimated Page Count: Comprehensive (exact number not specified, but typical for a parts catalog) Manual Type Type: Parts Manual / Parts Catalog Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Engine: Identification of all engine components and related parts Transmission: Identification of all transmission components and related parts Drivetrain: Identification of all drivetrain components including axles, driveshafts, and differentials Suspension Steering: Identification of all suspension and steering components Brakes: Identification of all brake system components Electrical: Identification of electrical components, sensors, and wiring harness parts Body Exterior: Identification of all exterior body panels, trim, lighting, and glass components Body Interior: Identification of all interior trim, seating, dashboard, and control components Heating Ventilation Air Conditioning: Identification of all HVAC system components Fuel System: Identification of fuel tank, pump, injectors, and related components Exhaust System: Identification of exhaust manifolds, catalytic converters, mufflers, and pipes Cooling System: Identification of radiator, water pump, hoses, and thermostat components Procedures Included Assembly Disassembly Diagrams: Yes, detailed exploded views Part Number Lookup: Yes, primary function Component Identification: Yes, detailed illustrations Technical Depth Depth: Detailed part identification and cataloging, essential for ordering and replacement 📊 Manual Specifications File Format Format: PDF Readability Requirement: Adobe PDF Reader recommended for optimal image/graphic display Print Quality Printable: Printable without restriction Binding Type Binding: N/A (Digital PDF) Paper Type Paper: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine A4 Engine Options: 2.0L TFSI I4 Turbocharged (170-200 hp), 3.0L V6 Naturally Aspirated (200-220 hp), 1.8L Turbo I4 (170 hp) S4 Engine Options: 4.2L V8 Naturally Aspirated (340 hp) Performance S4 Torque: 302 lb-ft @ 3500-4500 rpm A4 0 60 Mph: Varies by engine and drivetrain, approximately 6.5 - 8.5 seconds S4 0 60 Mph: Approximately 4.9 - 5.1 seconds Fuel System Fuel Delivery: Fuel injection (MPI/FSI depending on engine) Recommended Fuel: Premium Unleaded (91 octane or higher, especially for S4) 🔧 Transmission Standard A4 Transmission: 6-speed Manual, Tiptronic Automatic (6-speed) S4 Transmission: 6-speed Manual Optional S4 Transmission Optional: 6-speed Tiptronic Automatic Features Quattro System: Torsen center differential 📐 Dimensions Exterior Wheelbase: 104.2 inches (2647 mm) Length: Approx. 179.5 inches (4560 mm) Weights Curb Weight A4: Approx. 3400-3700 lbs (1542-1678 kg) Curb Weight S4: Approx. 3800-4000 lbs (1724-1814 kg) 🛡️ Safety Features Ratings NHTSA Front Impact Driver: 4 Stars (for sedan variants) NHTSA Front Impact Passenger: 4 Stars (for sedan variants) IIHS Side Impact: Good (for sedan variants) Active Features ABS: Standard Electronic Stability Control: Standard (ESP) Traction Control: Standard Passive Features Airbags: Frontal, Side-Curtain (standard) 💡 Technology Features Infotainment Audi Mmi Navigation: Available on higher trims and as an option, often with a central control knob. Premium Sound Options: Bose premium sound system was available. Driver Assistance Parking Sensors: Available as an option. Bi Xenon Headlights: Available as an option. Connectivity Bluetooth Handsfree: Available on later models or as an option, often via aftermarket integration or specific packages. 🔧 Maintenance Service Intervals Oil Change Interval: Typically 5,000-10,000 miles or 12 months, depending on driving conditions and oil type used (refer to specific service manual for exact recommendation). Timing Belt Maintenance: Some A4 models use timing chains; V6 and V8 engines typically use timing chains. Check manual for specific engine. Fluid Specifications Engine Oil Type: Synthetic engine oil, viscosity grades like 5W-40 or 0W-40 often recommended (refer to owner's manual/parts manual for specific engine) Coolant Type: G12 Plus or equivalent (pink/red coolant, ethylene glycol based) Brake Fluid Type: DOT 4 Known Issues Ignition Coils: Can be prone to failure, especially on early models with coil-on-plug systems. Pcv Valve System: Can clog or fail, leading to rough idle, oil leaks, or increased oil consumption. Oil Leaks: Common from valve cover gaskets, oil pan gaskets, and oil filter housings. Water Pump Premature Failure: Especially on the V8 S4, the water pump can be a point of failure. Suspension Components: Control arm bushings and ball joints can wear over time, leading to clunks and steering issues. Camshaft Tensioners (V8 S4): Known potential issue on the 4.2L V8, requiring significant repair. 📚 Vehicle History Brand Heritage Audi Legacy: Long history of engineering, particularly known for Quattro all-wheel drive and innovative design Model Evolution B6 Generation:...