🏷️ Basic Information Identification Make: Audi Model: S4 Year: 2001 Codes Chassis Code: B5 (Type 8D) Engine Code Primary: AVP Engine Code Secondary: AST 👋 Introduction Market Position Positioning: High-performance compact executive sedan. Competitive Analysis Competitors: BMW 330i, Mercedes-Benz C320, Lexus IS300. Key Features Performance Focus: 2.7L Biturbo V6 engine, Quattro AWD, sport-tuned suspension. Manual Advantage: Licensed OE data ensures accuracy and completeness, offering a superior alternative to generic repair guides. Manual Value Proposition Cost Savings: Empowers DIY repairs, significantly reducing dealership or independent shop labor costs. Convenience: Instant online access across multiple devices, eliminating the need for physical manuals. 📋 Manual Details Coverage Areas Primary Coverage: Complete Service and Repair Technical Scope: Factory-Derived OE Data Page Count Estimated Pages: Varies by Software Version (Likely 1000+ pages equivalent) Manual Type Type: Digital Service and Repair Manual Software Language Language: English Format Format: Online Web-Based Access (1 Year Subscription) Accessibility: PC, Laptop, Smartphone, Tablet via Web Browser 📖 Manual Coverage Systems Covered Powertrain: Engine mechanicals, Turbocharging, Fuel system, Ignition system, Exhaust system, Cooling system, Lubrication system Drivetrain: Manual Transmission (01E), Automatic Transmission (01G), Quattro All-Wheel Drive system (differentials, driveshafts, axles) Suspension Steering: Front suspension (multi-link), Rear suspension (independent), Power steering system, Steering column, Wheel alignment Brakes: Front/Rear disc brakes, ABS (Anti-lock Braking System), EBD (Electronic Brake-force Distribution), Brake hydraulics, Parking brake Electrical Electronics: Battery, Alternator, Starter, Lighting systems, Power windows/locks, Wipers, Horn, Fuses, Relays, ECU (Engine Control Unit), Immobilizer, Diagnostics (OBD-II) HVAC: Heating, Ventilation, Air Conditioning (A/C) system, Climate control Body Chassis: Body panels, Doors, Hood, Trunk, Bumpers, Interior trim, Frame structure Procedures Included Maintenance: Scheduled maintenance, Oil changes, Filter replacements, Spark plug replacement, Belt inspections/replacement, Fluid checks and top-offs Repair: Engine component replacement (turbochargers, intercoolers, injectors, coils), Transmission repair, Brake pad/rotor replacement, Suspension component replacement, Electrical component diagnosis and replacement, HVAC system service Diagnostics: Troubleshooting guides, Symptom-based diagnostics, Diagnostic Trouble Codes (DTCs) interpretation, Wiring diagrams for electrical systems Technical Specifications: Torque specifications, Clearance measurements, Fluid types and capacities, Wiring schematics, Component identification Technical Depth Depth: Comprehensive: Covers basic maintenance to complete engine and transmission overhauls, detailed diagnostic procedures, and wiring schematics. 📊 Manual Specifications File Format Format: Digital, Web-Based Print Quality Printability: Likely printable pages, quality dependent on user's printer. Binding Type Binding: N/A (Digital) Paper Type Paper: N/A (Digital) ⚙️ Engine Specifications Primary Engine Engine Type: 2.7L DOHC Twin-Turbocharged V6 (20v) Displacement: 2671 cc (2.7 Liters) Bore X Stroke: 81.0 mm x 86.4 mm Compression Ratio: 9.0:1 Turbochargers: Two parallel K03 turbochargers with intercoolers Performance Horsepower: 250 hp @ 5800 rpm Torque: 258 lb-ft (350 Nm) @ 1800-3600 rpm Fuel System Fuel Delivery: Multi-point Fuel Injection (MPI) Fuel Type: Premium Unleaded (91 Octane or higher recommended) Engine Management ECU: Bosch Motronic ME7.1 🔧 Transmission Standard Type: 6-Speed Manual Transmission (01E) Optional Type: 5-Speed Tiptronic Automatic Transmission (01G) Features Drivetrain: Quattro Permanent All-Wheel Drive with Torsen Center Differential 📐 Dimensions Exterior Length: 177.5 inches (4509 mm) Width: 69.5 inches (1765 mm) Height: 55.8 inches (1417 mm) Wheelbase: 102.7 inches (2609 mm) Weights Curb Weight Manual: approx. 3627 lbs (1645 kg) Curb Weight Automatic: approx. 3715 lbs (1685 kg) 🛡️ Safety Features Ratings NHTSA Front Impact: 4/5 Stars NHTSA Side Impact: 4/5 Stars Active Features ABS: Standard (4-wheel disc ABS) Traction Control: Standard (ASR - Anti-Slip Regulation) Stability Control: Not standard on all models/trims for 2001. Passive Features Airbags: Front driver and passenger airbags, Front side-impact airbags Seatbelts: 3-point inertia-reel seatbelts with pretensioners 💡 Technology Features Infotainment Audio System: Audi Concert or Audi Symphony audio system with CD player, available Bose premium sound system. Navigation: Optional Audi Navigation System Plus. Driver Assistance Parking Sensors: Optional rear parking sensors. Connectivity Phone Integration: Optional hands-free cellular phone preparation. Diagnostics OBD Standard: OBD-II (On-Board Diagnostics II) 🔧 Maintenance Service Intervals Oil Change Interval: Refer to manual (typically 7,500 - 10,000 miles or 12 months, depending on driving conditions) Timing Belt Service: N/A (This engine uses a timing chain) Spark Plug Replacement: Refer to manual (typically 40,000 - 60,000 miles) Fluid Specifications Engine Oil: API SG/SH/SJ, ACEA A3-96, SAE 0W-40 or 5W-40 (Consult manual for exact viscosity and specification) Coolant: G12 (Pink Antifreeze/Coolant) or equivalent G12+ approved coolant Transmission Fluid Manual: VW 501 50 (GL-4) SAE 75W-90 Transmission Fluid Automatic: G 052 162 A1 (LT 71141) or equivalent Brake Fluid: DOT 4 Known Issues Common Failures Engine: PCV system failures (leading to vacuum leaks/rough idle), Coil pack failures, Spark plug blow-outs, Turbocharger oil supply issues. Common Failures Suspension: Worn control arm bushings, worn tie rod ends, strut mount failure. Common Failures Electrical: Window regulator failure, ABS sensor failures, ignition switch issues. Common Failures Turbo: Turbocharger wastegate actuator issues, intercooler leaks. 📚 Vehicle History Brand Heritage Brand Focus: Audi's heritage in performance engineering and quattro all-wheel-drive technology. Model Evolution Generation: Second generation (B5) Audi A4 platform....