🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2012 Codes Chassis Code: GVB/GRB Engine Code: EJ257 👋 Introduction Market Position Positioning: Performance sedan positioned as a rally-bred, all-wheel-drive icon. Competitive Analysis Competitors: Mitsubishi Lancer Evolution, Volkswagen Golf GTI, Ford Focus RS. Key Features Drivetrain: Symmetrical All-Wheel Drive (SAWD), Driver Controlled Center Differential (DCCD). Engine: 2.5L turbocharged Boxer engine. Suspension: Performance-tuned suspension with inverted front struts. Styling: Aggressive styling with large rear wing, hood scoop, and fender flares. 📋 Manual Details Coverage Areas Coverage Scope: Complete service and repair for all systems and components. Page Count Estimated Pages: 2500+ Manual Type Type: Factory Service Manual / Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine: Engine mechanical, lubrication, cooling, fuel, ignition, exhaust, emissions, engine control. Transmission: Manual transmission (TY75) service, clutch, driveline, differentials. Brakes: Brake system hydraulics, ABS, EBD, parking brake. Steering: Power steering system, steering column, steering gear. Suspension: Front and rear suspension, struts, springs, bushings, alignment specifications. Electrical: Battery, charging system, starting system, lighting, instrumentation, body electrical, power accessories, wiring diagrams. HVAC: Heating, ventilation, and air conditioning system diagnostics and repair. Body: Body panels, doors, glass, interior trim, exterior trim, chassis frame. ECM Diagnostics: Powertrain Control Module (PCM) diagnostics, DTCs (Diagnostic Trouble Codes). Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, fluid checks, spark plug replacement. Troubleshooting: Diagnostic flowcharts, symptom-based troubleshooting, common problems and solutions. Repair: Component removal and installation, assembly and disassembly procedures. Engine Rebuild: Complete engine overhaul, internal component specifications, torque values. Transmission Rebuild: Manual transmission disassembly, inspection, repair, and reassembly. Diagnostics: OBD-II diagnostics, sensor testing, actuator testing. Alignment: Wheel alignment angles and specifications. Electrical Repair: Component testing, wiring harness repair, connector diagnosis. Suspension Repair: Strut replacement, bushing replacement, control arm service. Brake Service: Brake pad replacement, rotor replacement, brake bleeding. Technical Depth Depth: Comprehensive, suitable for professional technicians, covers basic to advanced repairs and diagnostics. 📊 Manual Specifications File Format Searchability: Fully searchable text content. Printability: Printable pages. Print Quality Resolution: High-resolution images and diagrams. Binding Type Binding: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Type: 2.5L DOHC 16-valve turbocharged Boxer Engine Code: EJ257 Performance Horsepower: 305 hp @ 6000 rpm Torque: 290 lb-ft @ 4000 rpm Redline: 7000 rpm Fuel System Induction: Turbocharged, Intercooled, Sequential Multi-Point Fuel Injection Fuel Type: Premium Unleaded Gasoline (91 Octane or higher recommended) Engine Management ECU: Subaru Engine Control Module (ECM) 🔧 Transmission Standard Type: 6-Speed Manual Transmission Gear Ratios: 1st: 3.636, 2nd: 2.157, 3rd: 1.529, 4th: 1.181, 5th: 0.974, 6th: 0.775 Optional Type: None (STI exclusively manual) Features Dccd: Driver Controlled Center Differential (DCCD) with Auto/Manual modes. Drivetrain System: Symmetrical All-Wheel Drive (SAWD) with front helical LSD and rear mechanical LSD. 📐 Dimensions Exterior Length: 179.5 inches (4560 mm) Width: 70.7 inches (1795 mm) Height: 58.1 inches (1475 mm) Wheelbase: 104.0 inches (2640 mm) Ground Clearance: 5.0 inches (127 mm) Weights Curb Weight: Approx. 3373 lbs (1530 kg) Gross Vehicle Weight Rating: Approx. 4387 lbs (1990 kg) 🛡️ Safety Features Ratings NHTSA Front Crash: 5-Star NHTSA Side Crash: 5-Star NHTSA Rollover: 4-Star Active Features ABS: Anti-lock Braking System (ABS) with EBD (Electronic Brake-force Distribution). Traction Control: Vehicle Dynamics Control (VDC) with Sport Mode. AWD: Symmetrical All-Wheel Drive (SAWD) for enhanced stability and traction. Passive Features Airbags: Front dual-stage airbags, front side-impact airbags, side curtain airbags. Seatbelts: 3-point height-adjustable front seatbelts with pre-tensioners and force limiters, rear 3-point seatbelts. Child Anchors: LATCH (Lower Anchors and Tethers for CHildren) system. 💡 Technology Features Infotainment Head Unit: Standard AM/FM/CD/MP3 audio system with auxiliary input. Optional navigation system. Speakers: 6-speaker audio system. Driver Assistance Cruise Control: Standard electronic cruise control. Keyless Entry: Standard keyless entry and engine immobilizer. Connectivity Usb: Auxiliary input jack for audio devices. Performance Tech Si Drive: Subaru Intelligent Drive (SI-DRIVE) system allowing driver to select between Intelligent, Sport, and Sport Sharp modes, affecting throttle response, engine mapping, and VDC parameters. 🔧 Maintenance Service Intervals Oil Change: Every 3,750 miles (6,000 km) or 6 months, whichever comes first (severe driving conditions) / 7,500 miles (12,000 km) or 12 months (normal driving). Air Filter: Every 15,000 miles (24,000 km) or 12 months. Cabin Filter: Every 15,000 miles (24,000 km) or 12 months. Spark Plugs: Every 30,000 miles (48,000 km). Coolant Flush: Every 30,000 miles (48,000 km) or 24 months. Transmission Fluid: Every 30,000 miles (48,000 km) for manual transmission. Fluid Specifications Engine Oil: SAE 5W-30, API SN or ILSAC GF-5 certified (Subaru Extra Strength or equivalent). Engine Oil Capacity: 5.7 US quarts (5.4 L) with filter change. Transmission Fluid: Subaru Extra-S or equivalent SAE 75W-90 GL-5 gear oil. Differential Fluid: Subaru Extra-S or equivalent SAE 75W-90 GL-5 gear oil. Coolant: Subaru Super Coolant (Blue) or equivalent ethylene glycol-based coolant with long-life additives, pre-mixed...