🏷️ Basic Information Identification Make: Subaru Model: Impreza Year: 2006 Generation Generation Designation: Second Generation (GD/GG) Generation Years: 2002-2007 Codes Chassis Code: GD (Sedan), GG (Wagon) 👋 Introduction Market Position Vehicle Segment: Compact Car / Rally-inspired Performance Car Competitive Analysis Competitors: Mitsubishi Lancer Evolution, Mazda3, Honda Civic Si, Volkswagen GTI Key Features Drivetrain: Subaru's Symmetrical All-Wheel Drive (AWD) system Engine Layout: Horizontally-opposed (Boxer) engine Manual Benefit Diy Capability: Enables owners to perform maintenance, servicing, diagnosis, and repairs themselves. 📋 Manual Details Coverage Areas Engine Variants Covered: H4DOTC (Naturally Aspirated Boxer), H4SO (Naturally Aspirated Boxer), STi (Turbocharged Boxer) Body Styles Covered: Sedan, Wagon Page Count Estimated Page Count: Likely 1000+ pages (typical for comprehensive service manuals) Manual Type Type: Service and Repair Manual Language Language: English Format Format: PDF (Digital Download) 📖 Manual Coverage Systems Covered Powertrain: Engine mechanicals, fuel system, ignition system, exhaust system, cooling system, lubrication system Transmission: Manual and Automatic Transmission service, repair, and diagnostics Chassis: Suspension, steering, brakes, drivetrain (AWD system) Body: Body panels, interior trim, exterior components, collision repair procedures Electrical: Wiring diagrams, electrical components, lighting, audio systems, comfort and convenience features Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, fluid checks and top-offs Diagnostics: Troubleshooting common problems, diagnostic trouble codes (DTCs), pinpoint tests Repair: Step-by-step repair instructions for all major systems, including engine rebuilds, transmission overhauls, brake replacements, and more Technical Depth Depth: Comprehensive from basic maintenance to advanced engine and transmission diagnostics and repair. Includes exploded diagrams for detailed component identification and assembly. 📊 Manual Specifications File Format File Format: PDF Print Quality Printability: Printable pages Binding Type Binding: Not Applicable (Digital Download) Paper Type Paper Type: Not Applicable (Digital Download) Compatibility Operating Systems: All versions of Windows & Mac Requirements Software Requirements: Adobe PDF Reader, WinZip ⚙️ Engine Specifications Primary Engine H4Dotc Engine Code: EJ253 (typically) H4Dotc Displacement: 2.5 Liters (2457 cc) H4Dotc Configuration: Naturally Aspirated Flat-4 (Boxer) H4Dotc Horsepower: Approx. 165-173 hp @ 5600-6000 rpm H4Dotc Torque: Approx. 166-170 lb-ft @ 3700-4000 rpm H4So Engine H4So Engine Code: EJ205 (typically for WRX, though 'SO' might indicate other NA variants) H4So Displacement: 2.0 Liters (1994 cc) or 2.5 Liters (2457 cc) H4So Configuration: Naturally Aspirated Flat-4 (Boxer) H4So Horsepower: Varies by specific engine code and market. NA models typically 170-180 hp. H4So Torque: Varies by specific engine code and market. NA models typically 166-170 lb-ft. Sti Engine Sti Engine Code: EJ257 Sti Displacement: 2.5 Liters (2457 cc) Sti Configuration: Turbocharged Flat-4 (Boxer) Sti Horsepower: Approx. 300 hp @ 6000 rpm Sti Torque: Approx. 300 lb-ft @ 4000 rpm Fuel System Fuel Delivery: Electronic Fuel Injection (EFI) Fuel Type: Unleaded gasoline. Premium unleaded recommended for STi. 🔧 Transmission Standard Standard Transmission Type: 5-speed manual (most NA models), 6-speed manual (STi) Optional Optional Transmission Type: 4-speed automatic (some NA models) Features AWD System: Symmetrical All-Wheel Drive (AWD) with viscous coupling center differential Sti Center Differential: Driver-controlled Center Differential (DCCD) 📐 Dimensions Exterior Wheelbase: Approx. 103.1 inches (2619 mm) Length: Sedan: Approx. 177.0 inches (4496 mm), Wagon: Approx. 177.9 inches (4519 mm) Width: Approx. 69.7 inches (1770 mm) Height: Sedan: Approx. 56.1 inches (1425 mm), Wagon: Approx. 57.7 inches (1466 mm) Weights Curb Weight: Varies by model and transmission, typically 3000-3400 lbs (1360-1540 kg) Sti Curb Weight: Approx. 3200-3350 lbs (1450-1520 kg) 🛡️ Safety Features Ratings NHTSA Front Impact: 5 Stars (2006 model) NHTSA Side Impact: 4 Stars (2006 model) Active Features ABS: Standard Anti-lock Braking System Traction Control: Available Traction Control System (TCS) Passive Features Airbags: Front airbags, side curtain airbags (optional/standard depending on trim) Seatbelts: 3-point seatbelts with pretensioners 💡 Technology Features Infotainment Infotainment System: Basic AM/FM/CD audio system, with optional premium audio or in-dash navigation on higher trims. Driver Assistance Driver Assistance Features: Limited by modern standards; primarily ABS and optional traction control. Connectivity Connectivity Options: Auxiliary input for audio (on some models), basic Bluetooth for phone calls (aftermarket often required). 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 3,750 miles or 6 months, or 7,500 miles/12 months with synthetic oil (check owner's manual for specific recommendation) Major Service Points: Timing belt replacement (for EJ20 engines, if applicable), spark plugs, coolant flush, brake fluid flush Fluid Specifications Engine Oil Type: Refer to owner's manual. Typically 5W-30 or 10W-30 for NA models, 5W-30 or 5W-40 synthetic for STi. Coolant Type: Subaru Super Coolant (blue) or equivalent silicate-free, ethylene glycol-based coolant. Transmission Fluid Manual: Refer to manual. Typically Subaru Extra-S Gear Oil or equivalent API GL-5 rated gear oil. Transmission Fluid Automatic: Subaru ATF HP (High Performance) or equivalent Dexron III/Mercon compatible fluid. Known Issues Head Gaskets: While later generations improved, some EJ series engines can be prone to head gasket leaks. The manual will detail inspection and replacement procedures. Turbo Failures Sti: Turbocharger issues can occur on STi models due to high...