🏷️ Basic Information Identification Make: Subaru Model: Impreza Year: 2006 Codes Chassis Code: GDB (GD/GG generation) 👋 Introduction Market Position Segment: Compact Sports Sedan/Hatchback Competitive Analysis Competitors: Mitsubishi Lancer Evolution, MazdaSpeed3, Volkswagen GTI, Ford Focus ST Key Features Performance Orientation: Known for its Symmetrical All-Wheel Drive system and rally-inspired performance, especially in WRX and STi variants. Manual Benefit: Empowers owners to perform maintenance and repairs, saving costs and enhancing vehicle understanding. 📋 Manual Details Coverage Areas Primary Coverage: Repair, Servicing, Preventative Maintenance Engine Coverage: H4DOTC (Naturally Aspirated), H4SO (Turbocharged), STi Engine (Performance Turbocharged) Page Count Estimated Pages: Not specified, but expected to be extensive for a comprehensive service manual. Manual Type Type: Service and Repair Manual Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Powertrain: Engine (H4DOTC, H4SO, STi), Transmission (Manual & Automatic variants likely covered) Chassis And Body: Body, Chassis (Suspension, Steering, Brakes) Electrical: Wiring Diagrams, Electrical System Components Engine Mechanical: Engine assembly, disassembly, internal components (pistons, rods, crankshaft, cylinder heads), lubrication, cooling systems. Fuel And Emissions: Fuel delivery, injectors, fuel pump, evaporative emissions control, catalytic converter systems. Procedures Included Maintenance: Scheduled Maintenance, Fluid Changes, Filter Replacements Diagnostics And Repair: Troubleshooting Guides, Step-by-Step Repair Procedures, Component Replacement Drivetrain Repair: Manual and automatic transmission overhaul, differential service, driveshaft and CV joint replacement. Suspension And Steering: Strut replacement, ball joint service, power steering system repair, alignment specifications. Brake System Service: Brake pad and rotor replacement, caliper service, brake bleeding procedures, ABS system diagnostics. Technical Depth Depth: Comprehensive, covering general information, detailed system repairs, and technical references. Diagnostic Trouble Codes: Includes procedures for reading and interpreting diagnostic trouble codes (DTCs). Wiring Diagrams: Detailed wiring schematics for all major electrical systems, crucial for troubleshooting electrical faults. 📊 Manual Specifications File Format Compatibility: Win/Mac Searchability: PDF format typically allows for text searching, aiding in quick information retrieval. Print Quality Printability: All pages are printable. Binding Type Binding: Digital (PDF - printable) Paper Type Paper Type: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Code Na: H4DOTC (2.5L Naturally Aspirated Boxer-4) Engine Code Turbo: H4SO (2.5L Turbocharged Boxer-4 - WRX) Engine Code Sti: EJ257 (2.5L High-Performance Turbocharged Boxer-4 - STI) Performance Hp Na Approx: ~170-180 hp Hp Wrx Approx: ~230 hp Hp Sti Approx: ~300 hp Fuel System Injection Type: Multi-point Fuel Injection (MPI) for NA, Sequential Electronic Fuel Injection (SEFI) for Turbocharged variants. Octane Rating Turbo: Premium Unleaded (91 AKI or higher) recommended for Turbocharged engines. 🔧 Transmission Standard Transmission Type: 5-speed Manual Transmission (common on many trims) Optional Transmission Type Optional: 4-speed Automatic Transmission (available on some NA models) Features AWD System: Symmetrical All-Wheel Drive (SAWD) with viscous coupling center differential (manual), or electronically controlled all-wheel drive (automatic). 📐 Dimensions Exterior Wheelbase Inches: 103.0 Length Inches: 173.8 (Sedan), 174.5 (Wagon) Width Inches: 68.7 Weights Curb Weight Lbs Approx: 3000-3300 lbs (depending on trim and transmission) 🛡️ Safety Features Ratings NHTSA Front Impact: 5-Star (for 2006 model year) IIHS Side Impact: Good (for 2006 model year) Active Features ABS: Standard on most trims Traction Control: Available on some trims Passive Features Airbags: Frontal airbags, front side-impact airbags, available side-curtain airbags. 💡 Technology Features Infotainment Audio System: Factory radio with CD player, possibly with optional premium audio or in-dash navigation on higher trims. Driver Assistance ABS Standard: Standard ABS system. Connectivity Auxiliary Input: Likely available as an option or dealer add-on, not standard on all models. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 3,750 miles or 6 months for severe driving, or 7,500 miles/12 months for normal driving (check manual for specific recommendation). Timing Belt Replacement: Required around 105,000 miles for EJ series engines (check manual). Fluid Specifications Engine Oil Type: Refer to owner's manual or manual for specific viscosity grade (e.g., 5W-30 or 5W-40 for turbo models). Coolant Type: Subaru Super Coolant (blue) or equivalent silicate-free long-life coolant. Transmission Fluid Manual: Gear oil GL-5, SAE 75W-90 is commonly recommended for manual transmissions. Transmission Fluid Auto: Subaru ATF HP (High Performance) or equivalent approved fluid for automatic transmissions. Known Issues Head Gasket Leaks: While less prevalent in the 2.5L turbo than earlier Subaru engines, head gasket integrity is still a point of vigilance. Turbocharger Failure: Can occur in high-mileage or poorly maintained turbo models; proper oil changes and avoiding prolonged idling after hard driving are crucial. Clutch Wear: High-performance driving or aggressive clutch use can accelerate wear on manual transmission clutches. 📚 Vehicle History Brand Heritage Brand Legacy: Subaru is renowned for its pioneering use of Symmetrical All-Wheel Drive and its strong ties to rally racing. Model Evolution Generation Name: Second Generation (GD/GG chassis) Redesign Notes: This generation saw a significant redesign with improved aerodynamics, chassis rigidity, and enhanced performance, particularly for WRX and STi models. Production Production Period: 2000-2007 (GD/GG generation) 🏆 Awards & Recognition Recognitions Rally Heritage:...