🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2012 Codes Chassis Code: GV Engine Code: EJ257 👋 Introduction Market Position Segment: Performance Compact Sedan/Hatchback Usp: Iconic rally heritage, turbocharged performance, symmetrical AWD Competitive Analysis Competitors 2012: Mitsubishi Lancer Evolution, Volkswagen Golf GTI, Ford Focus RS Key Features Performance Focus: Engineered for driving dynamics and motorsport-inspired performance AWD System: Advanced Driver Controlled Center Differential (DCCD) for variable torque distribution Suspension Tuning: Performance-tuned suspension for superior handling and grip Braking System: Upgraded Brembo braking system for enhanced stopping power 📋 Manual Details Coverage Areas Primary Coverage: Full Factory Service and Workshop Repair Diagnostic Coverage: Extensive diagnostic procedures and troubleshooting guides Repair Coverage: Component-level repair procedures for all major systems Maintenance Coverage: Scheduled maintenance, fluid changes, filter replacements Electrical Coverage: Detailed wiring diagrams, electrical component testing Body Coverage: Body repair, panel replacement, alignment specifications Suspension Steering Coverage: Suspension component replacement, alignment procedures, steering system repair Braking Coverage: Brake system overhaul, ABS diagnosis, caliper and rotor replacement Heating Cooling Coverage: HVAC system diagnosis, refrigerant handling, component replacement Page Count Estimated Pages: 2000+ Manual Type Type: Factory Service Manual / Workshop Manual Language Language: English Format Format: Digital Download (PDF) Accessibility: Instant Download 📖 Manual Coverage Systems Covered Powertrain: Engine, Turbocharger, Intercooler, Exhaust System Drivetrain: Symmetrical All-Wheel Drive (AWD) system, differentials (front, center, rear), driveshafts, CV joints Transmission: 6-Speed Manual Transmission (TY856), clutch system, gearbox overhaul Suspension: Front MacPherson struts, rear double wishbone, springs, dampers, bushings, alignment specifications Steering: Hydraulic power steering system, steering rack, tie rods Brakes: Front Brembo 4-piston calipers, rear Brembo 2-piston calipers, vented rotors, ABS, EBD, brake fluid specifications Electrical System: ECU, sensors, ignition system, lighting, battery, charging system, starter motor, infotainment wiring Climate Control: Air conditioning, heater, ventilation, cabin filter replacement Fuel System: Fuel pump, fuel injectors, fuel filter, fuel pressure regulator Cooling System: Radiator, water pump, thermostat, coolant specifications, fan control Body And Trim: Exterior panels, interior trim, seats, doors, windows, locks, glass replacement Safety Systems: Airbag system, seatbelt mechanisms, SRS component testing Procedures Included Routine Maintenance: Oil changes, filter replacements, spark plug replacement, brake pad inspection/replacement Engine Overhaul: Engine disassembly, inspection, reassembly, torque specifications, timing belt/chain procedures Transmission Rebuild: Gearbox disassembly, clutch replacement, synchro ring replacement, gear inspection Brake System Repair: Caliper rebuild, rotor replacement, master cylinder replacement, bleeding procedures Suspension Alignment: Front and rear wheel alignment procedures and specifications Electrical Troubleshooting: Diagnostic flowcharts, component testing, wiring harness repair Turbocharger Service: Turbocharger inspection, replacement, oil and coolant line maintenance Diagnostics: OBD-II trouble codes, diagnostic data interpretation, sensor testing Recalibration Procedures: Throttle body calibration, steering angle sensor calibration (where applicable) Technical Depth Depth: Comprehensive factory-level repair and diagnostic information Detail Level: Step-by-step instructions with torque specifications and diagrams Diagnostics Level: Advanced diagnostic procedures for complex issues Rebuild Scope: Full engine and transmission rebuilds supported 📊 Manual Specifications File Format Format: PDF Searchability: Searchable text for quick information retrieval Resolution: High-resolution scans for clear diagrams and text Print Quality Printability: Printable pages for workshop use Binding Type Binding: N/A (Digital) Paper Type Paper Type: N/A (Digital) ⚙️ Engine Specifications Primary Engine Engine Type: Horizontally Opposed (Boxer), Turbocharged, Intercooled Engine Code: EJ257 Displacement: 2.5 Liters (2457 cc) Bore X Stroke: 99.5 mm x 79.0 mm Compression Ratio: 8.2:1 Performance Horsepower: 305 hp @ 6000 rpm Torque: 290 lb-ft @ 4000 rpm Fuel System Fuel Delivery: Sequential Electronic Fuel Injection (SEFI) Fuel Type: Premium Unleaded Gasoline (91 Octane or higher recommended) Engine Management ECU: Subaru Engine Control Unit (ECU) with advanced mapping Turbocharging Turbocharger Model: IHI VF48 Intercooler Type: Top-mount intercooler 🔧 Transmission Standard Transmission Type: 6-Speed Manual (TY856) Optional Optional Transmission: N/A (STI exclusively manual) Features Dccd: Driver Controlled Center Differential (DCCD) with automatic and manual modes Differentials: Helical limited-slip front differential, viscous coupling center differential, Torsen limited-slip rear differential Fluid Specifications Manual Transmission Fluid: Subaru Extra-S Gear Oil (75W-90 GL-5) or equivalent 📐 Dimensions Exterior Length: 173.8 inches (4415 mm) Width: 70.1 inches (1780 mm) Height: 57.4 inches (1458 mm) Wheelbase: 103.0 inches (2616 mm) Ground Clearance: 5.1 inches (130 mm) Weights Curb Weight: Approx. 3,373 lbs (1530 kg) Gross Vehicle Weight Rating: Approx. 4,300 lbs (1950 kg) Cargo Cargo Volume Sedan: 11.3 cu ft (0.32 m³) Wheels Tires Wheel Size: 18 x 8.5 inch alloy wheels Tire Size: 245/40R18 Bolt Pattern: 5 x 114.3 mm 🛡️ Safety Features Ratings NHTSA Overall: 4/5 Stars (for 2012 Impreza range, STI specific may vary slightly) IIHS Status: Good (for structure/safety systems on related Impreza models) Active Features ABS: Anti-lock Braking System (ABS) with Electronic Brake-force Distribution (EBD) Traction Control: Traction Control System (TCS), Vehicle Dynamics Control (VDC) AWD System: Symmetrical All-Wheel Drive with DCCD for active traction management Passive Features Airbags: Front dual-stage airbags, front side-impact airbags, curtain airbags Seatbelts: 3-point height-adjustable front seatbelts with pretensioners and force limiters...