🏷️ Basic Information Identification Make: Subaru Model: Legacy Year: 2004 Codes Chassis Code: BP (Wagon), BL (Sedan) 👋 Introduction Market Position Segment: Mid-size sedan and wagon, known for its standard All-Wheel Drive (AWD) and practical nature. Competitive Analysis Competitors: Toyota Camry, Honda Accord, Mazda6, Nissan Altima. Key Features AWD Standard: Standard Symmetrical All-Wheel Drive system across all trims, a significant differentiator. Body Styles: Available as a four-door sedan and a five-door wagon. Manual Benefit Target Audience: DIY mechanics, independent repair shops, and Subaru owners looking to perform their own maintenance and repairs. 📋 Manual Details Coverage Areas General Coverage: Complete factory service and repair information for the 2004 Subaru Legacy. Specific Systems: Engine mechanical, engine performance, fuel system, emissions control, transmission, drivetrain, suspension, steering, brakes, body, chassis electrical, HVAC, and diagnostics. Page Count Estimated Pages: 1500+ Manual Type Type: Factory Service Manual / Workshop Manual Language Language: English Format Format: Digital (likely PDF) 📖 Manual Coverage Systems Covered Engine: 2.5L EJ25 SOHC and DOHC naturally aspirated and turbocharged variants, timing belt service, head gasket repair, cooling system, lubrication system. Transmission: 5-speed manual transmission (TY757 series), 4-speed automatic transmission (4EAT, TZ1A series), clutch replacement, transmission fluid service, differential service. Drivetrain: All-Wheel Drive (AWD) system operation, front and rear differentials, driveshafts, CV joints, wheel bearing replacement. Suspension: Front MacPherson strut, rear multi-link independent suspension, shock absorber replacement, spring replacement, control arm service, sway bar adjustment. Steering: Power steering system diagnosis and repair, steering rack replacement, tie rod end service, steering angle sensor calibration. Brakes: Front and rear disc brakes, ABS system diagnosis and repair, brake fluid flush, caliper and rotor replacement, parking brake adjustment. Electrical: ECU and sensor diagnostics, wiring diagrams, charging system (alternator, battery), starting system, lighting systems, power windows, central locking, airbag system. HVAC: Air conditioning system (refrigerant types, service procedures), heater core replacement, blower motor, climate control unit diagnostics. Procedures Included Maintenance: Oil and filter change, air filter replacement, cabin air filter replacement, spark plug replacement, fuel filter replacement, coolant flush, brake fluid change, transmission fluid change, differential fluid change. Diagnostics: OBD-II trouble codes (DTCs), sensor testing, actuator testing, wiring harness continuity checks, common fault diagnosis. Repair: Engine rebuild, head gasket replacement, timing belt replacement, turbocharger repair/replacement (turbo models), transmission overhaul, suspension component replacement, brake system overhaul, body panel repair. Troubleshooting: Step-by-step diagnostic flowcharts for common drivability issues, electrical problems, and mechanical failures. Specifications: Torque specifications for all critical fasteners, engine clearances, fluid capacities, electrical component resistance values. Technical Depth Depth: Comprehensive, covering everything from basic maintenance to complete engine and transmission rebuilds. Suitable for DIY enthusiasts and professional mechanics. 📊 Manual Specifications File Format Quality: High-resolution scans, searchable text for ease of navigation, clear and legible diagrams. Print Quality Diagrams: Top quality diagrams, illustrations, and schematics are a key feature. Binding Type Binding: N/A (Digital Format) Paper Type Paper Quality: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Code 1: EJ253 Engine Type 1: 2.5L SOHC Naturally Aspirated Flat-4 Boxer Displacement 1: 2457 cc Horsepower 1: 165 hp @ 5600 rpm Torque 1: 166 lb-ft @ 3600 rpm Secondary Engine Engine Code 2: EJ255 (GT models) Engine Type 2: 2.5L DOHC Turbocharged Flat-4 Boxer Displacement 2: 2457 cc Horsepower 2: 210 hp @ 5600 rpm Torque 2: 236 lb-ft @ 3600 rpm Fuel System Injection: Electronic Fuel Injection (EFI) Fuel Type: Unleaded gasoline Engine Maintenance Timing Belt Replacement Interval: 105,000 miles or 105 months (whichever comes first) - Crucial for Boxer engines. Spark Plug Type: Iridium type, e.g., NGK IFR6A-11 or equivalent Oil Type Recommendation: SAE 5W-30 Synthetic or Synthetic Blend (API SN or higher) 🔧 Transmission Standard Transmission Type Standard: 5-speed manual transmission (TY757 series) Optional Transmission Type Optional: 4-speed automatic transmission (4EAT / TZ1A series) Features AWD Operation: Variable torque distribution, viscous coupling center differential (manual), planetary gear center differential with electronically controlled clutch pack (automatic). Maintenance Manual Transmission Fluid Spec: GL-5 75W-90 Gear Oil (refer to manual for exact fill level and quantity) Automatic Transmission Fluid Spec: Subaru ATF HP (or equivalent Dexron III/Mercon compatible fluid, verify in manual) 📐 Dimensions Exterior Sedan Length: Approx. 187.4 inches Wagon Length: Approx. 187.6 inches Width: Approx. 68.1 inches Height: Approx. 56.1 inches (Sedan), 57.7 inches (Wagon) Weights Curb Weight Start: Approx. 3200 lbs Curb Weight End: Approx. 3500 lbs (depending on trim and drivetrain) Cargo Sedan Trunk Volume: Approx. 14.7 cubic feet Wagon Cargo Volume Seats Up: Approx. 33.5 cubic feet Wagon Cargo Volume Seats Down: Approx. 65.4 cubic feet Wheels Tires Wheel Bolt Pattern: 5x100 Standard Tire Size: 205/50R17 or 215/45R17 (varies by trim) 🛡️ Safety Features Ratings NHTSA Front Impact: 5 Stars (Driver and Passenger) NHTSA Side Impact: 5 Stars (Front and Rear Passengers) IIHS Front Crash: Good IIHS Side Impact: Good Active Features ABS: Standard Anti-lock Braking System (ABS) Traction Control: Available Traction...