🏷️ Basic Information Identification Make: Subaru Model: Impreza Year: 2004 Product Type: Workshop Repair Service Manual Product Format: PDF Download Codes Chassis Codes: GD, GG (Sedan/Wagon) Engine Codes: EJ201, EJ202, EJ251, EJ253, EJ205 (WRX), EJ207 (WRX STI - JDM) 👋 Introduction Market Position Segment: Compact Car / Affordable Performance Sedan/Wagon Competitors: Honda Civic, Toyota Corolla, Mazda3, Mitsubishi Lancer Competitive Analysis Differentiators: Standard Symmetrical All-Wheel Drive, rally-inspired WRX/STI variants, boxer engine layout Key Features Powertrain Highlight: Horizontally opposed ('boxer') engine and Symmetrical All-Wheel Drive Performance Variants: WRX and WRX STI models offered with turbocharged engines and enhanced performance features Body Styles: Available as a 4-door sedan and a 5-door wagon 📋 Manual Details Coverage Areas Covered Models: All Impreza Models (Sedan & Wagon) Covered Trims: All Trim Levels (e.g., RS, TS, Outback Sport, WRX, WRX STI) Covered Transmissions: Manual and Automatic Transmissions Page Count Estimated Pages: Extensive (typically 2000+ pages for comprehensive workshop manuals) Manual Type Type: Workshop Repair Service Manual Language Language: English Format Digital Format: PDF (Searchable) 📖 Manual Coverage Systems Covered Powertrain: Engine mechanical, fuel system, ignition system, cooling system, lubrication system, exhaust system, engine management (ECU/ECM) Transmission Drivetrain: Manual transmission, automatic transmission, clutch, differential, axles, driveshafts, AWD system (Symmetrical All-Wheel Drive) Chassis Suspension: Front suspension, rear suspension, steering system, wheels, tires Brakes: Front brakes, rear brakes, parking brake, ABS (Anti-lock Braking System) Electrical: Battery, charging system, starting system, lighting system, instrumentation, body electrical, power accessories, wiring diagrams HVAC: Heating, Ventilation, and Air Conditioning system Body Exterior: Body panels, doors, hood, trunk, bumpers, glass, exterior trim Body Interior: Seats, dashboard, interior trim, airbags, seatbelts Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, fluid checks, tune-ups Repair: Engine overhaul, transmission repair, brake service, suspension repair, electrical diagnostics and repair, bodywork repair Troubleshooting: Diagnostic trouble codes (DTCs), symptom-based troubleshooting guides Specifications: Torque specifications, clearances, fluid capacities, component dimensions Diagnostics: OBD-II diagnostics, sensor testing, actuator testing Technical Depth Depth: Comprehensive (from basic maintenance to complete engine and transmission rebuilds) Target Audience: Professional Technicians and Enthusiast DIY Mechanics 📊 Manual Specifications File Format PDF Quality: High-resolution, searchable text, bookmarked chapters Printability: Printable pages Binding Type Digital Binding: N/A (Digital PDF) Paper Type Digital Paper Type: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Naturally Aspirated: 2.5L EJ253 (SOHC, 167 hp @ 5600 rpm, 166 lb-ft @ 4000 rpm) and 2.0L EJ201/EJ202 (SOHC/DOHC, 142-147 hp, 135-140 lb-ft) Turbocharged: 2.0L EJ205 (WRX - DOHC, 227 hp @ 5600 rpm, 217 lb-ft @ 3200 rpm) and 2.0L EJ207 (WRX STI - DOHC, 261-276 hp, 250-253 lb-ft depending on market/spec) Performance Compression Ratio Na: 9.7:1 (EJ253), 9.2:1 (EJ201/202) Compression Ratio Turbo: 8.5:1 (EJ205), 8.0:1 (EJ207) Fuel System Injection Type: Multi-point Fuel Injection (MPI) Fuel Type: Unleaded gasoline (91 octane recommended for WRX/STI) Engine Layout Layout: Horizontally opposed (Boxer) Cylinders: 4 Engine Management ECU Type: Subaru Engine Control Unit (ECU/ECM) 🔧 Transmission Standard Manual Transmission: 5-speed manual (all-wheel drive) Optional Automatic Transmission: 4-speed automatic (all-wheel drive) Features AWD System: Symmetrical All-Wheel Drive (with viscous coupling center differential) Sti Transmission: 6-speed manual transmission (WRX STI) Differential Type: Front: Open; Rear: Limited Slip Differential (LSD) (standard on WRX/STI, optional on some NA models) 📐 Dimensions Exterior Wheelbase Sedan: 2535 mm (99.8 in) Wheelbase Wagon: 2525 mm (99.4 in) Length Sedan: 4415 mm (173.8 in) Length Wagon: 4410 mm (173.6 in) Width: 1695 mm (66.7 in) Height: 1425 mm (56.1 in) sedan / 1450 mm (57.1 in) wagon Weights Curb Weight: Approx. 1300-1450 kg (2866-3197 lbs) depending on model/trim 🛡️ Safety Features Ratings NHTSA Front Impact: 4 Stars (Driver & Passenger) IIHS Front Offset: Good (for models equipped with side airbags) Active Features ABS: Standard Anti-lock Braking System Traction Control: Available (e.g., Subaru Vehicle Dynamics Control - VDC) Passive Features Airbags: Frontal airbags, optional front side-impact airbags Seatbelts: 3-point seatbelts with pretensioners 💡 Technology Features Infotainment Head Unit: Factory AM/FM/CD player, optional premium audio systems. Speaker System: Typically 4 or 6 speakers, Bose premium optional on some trims. Driver Assistance Cruise Control: Standard on most models ABS: Standard Anti-lock Braking System Connectivity Auxiliary Input: Not standard, aftermarket solutions available Usb Port: Not available from factory 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,750 miles or 6 months (severe duty) / 7,500 miles or 12 months (normal duty) Air Filter Replacement: Every 15,000 miles or 12 months Spark Plug Replacement Na: Every 60,000 miles (standard copper) Spark Plug Replacement Turbo: Every 30,000 miles (platinum or iridium recommended for performance) Fluid Specifications Engine Oil: SAE 5W-30 (API SG or higher, ILSAC GF-2 or higher). Consult manual for specific temperature ranges and synthetic recommendations. Coolant: Subaru Super Coolant (Blue) or equivalent ethylene glycol-based coolant (50/50 mix with distilled water) Transmission Fluid Manual: SAE 75W-90 GL-5 gear oil Transmission Fluid Automatic: Subaru ATF HP or Dexron III compatible Brake Fluid: DOT 3...