🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Model Variant: WRX STI Generation Generation Code: G3 Codes Chassis Code: GRF/GVF (Widebody) 👋 Introduction Market Position Segment: Performance Compact Sedan/Hatchback, Rally-Inspired Sport Compact Competitive Analysis Competitors: Mitsubishi Lancer Evolution, Subaru WRX (non-STI variants), Ford Focus RS (later models), Volkswagen Golf R. Key Features Performance Highlights: Symmetrical All-Wheel Drive, turbocharged Boxer engine, Driver Controlled Center Differential (DCCD), performance suspension and brakes. Target Audience: Enthusiasts seeking high-performance, all-weather capable, and customizable vehicles. 📋 Manual Details Coverage Areas Covered Years: 2012, 2013, 2014 Page Count Estimated Pages: Over 2000 (typical for full service manuals) Manual Type Type: Service and Repair Shop Manual Language Language: English Format Format: Digital Download (PDF) 📖 Manual Coverage Systems Covered Engine: EJ257 (2.5L Turbocharged Boxer), including tuning, diagnostics, and component repair. Transmission: 6-speed manual (Type RA) and DCCD (Driver Controlled Center Differential) system. Drivetrain: All-Wheel Drive (Symmetrical AWD), front/rear differentials, driveshafts, CV joints. Suspension: Front/rear suspension components, spring rates, damper specifications, alignment procedures. Brakes: Brembo 4-piston front/2-piston rear brake system, ABS, EBD, brake fluid bleeding, component replacement. Electrical: Complete wiring diagrams, ECU, sensors, lighting, power distribution, starter, alternator, battery. Fuel System: Fuel injectors, fuel pump, fuel pressure regulator, EVAP system, emissions control. Cooling System: Radiator, intercooler, coolant hoses, water pump, thermostat, system flush. Exhaust System: Turbocharger, downpipe, catalytic converter, mufflers, heat shields. Body And Chassis: Body panels, doors, fenders, bumpers, underbody, chassis reinforcement. Interior: Seats, dashboard, trim panels, HVAC controls, SRS airbag system. HVAC: Air conditioning system, heater core, blower motor, climate control diagnostics. Diagnostics: OBD-II diagnostics, fault code interpretation, sensor data analysis, troubleshooting guides. Procedures Included Maintenance: Oil changes, filter replacements, spark plug replacement, fluid checks and flushes, belt inspection/replacement. Engine Repair: Timing belt/chain service, piston/ring replacement, head gasket repair, valve adjustments, turbocharger rebuild. Transmission Repair: Clutch replacement, gearbox rebuild, DCCD actuator servicing. Brake Repair: Brake pad/rotor replacement, caliper servicing, brake line replacement, ABS component diagnostics. Electrical Repair: Wiring harness repair, sensor replacement, starter/alternator replacement, ECU troubleshooting. Suspension And Steering: Strut/shock replacement, control arm replacement, wheel bearing replacement, power steering system service. Troubleshooting: Step-by-step diagnostic procedures for common and uncommon issues. Component Replacement: Detailed instructions for replacing virtually all serviceable parts. Bodywork And Trim: Removal and installation of interior and exterior trim components, body panel adjustments. Technical Depth Depth: Comprehensive, from basic maintenance to complete engine and transmission rebuilds. Includes factory diagnostic procedures and specifications. 📊 Manual Specifications File Format File Type: PDF Searchable Text: Yes (typically for professional downloads) Print Quality Printability: High-resolution for clear printing of diagrams and text. Binding Type Binding: Not Applicable (Digital Download) Paper Type Paper: Not Applicable (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Code: EJ257 Engine Type: 2.5L DOHC 16-valve turbocharged Boxer 4-cylinder Performance Horsepower: 305 hp @ 6000 rpm Torque: 290 lb-ft @ 4000 rpm Fuel System Fuel Delivery: Sequential Multi-port Fuel Injection (SMPI) Fuel Type: Premium Unleaded Gasoline (91 octane or higher recommended) Engine Management ECU Type: ECU with integrated engine and DCCD control 🔧 Transmission Standard Transmission Type: 6-speed Manual Transmission Optional Optional Transmission: N/A for STI model Features Dccd: Driver Controlled Center Differential (DCCD) with manual and automatic modes. Maintenance Transmission Fluid Spec: Subaru Extra-S Gear Oil (or equivalent API GL-5, SAE 75W-90) 📐 Dimensions Exterior Length: 179.7 in (4565 mm) Width: 70.7 in (1795 mm) Height: 58.1 in (1475 mm) Weights Curb Weight: 3417 lbs (1550 kg) Gross Vehicle Weight Rating: 4590 lbs (2082 kg) 🛡️ Safety Features Ratings NHTSA Overall Rating: 4/5 Stars (for 2012 model, specific STI ratings may vary) Active Features Active Safety: Vehicle Dynamics Control (VDC), Traction Control System (TCS), Anti-lock Braking System (ABS), Electronic Brake-force Distribution (EBD), Active Torque Split AWD. Passive Features Passive Safety: Frontal airbags, front side-impact airbags, side curtain airbags, driver's knee airbag, front seatbelt pretensioners, active front head restraints. 💡 Technology Features Infotainment Infotainment System: Subaru's Starlink infotainment system with touchscreen, Bluetooth, USB connectivity, optional navigation. Driver Assistance Driver Assistance Features: Key features focus on performance dynamics: Traction Control, VDC, DCCD. Advanced driver-assistance systems (ADAS) like EyeSight were not standard or widely available on the STI during these model years. Connectivity Connectivity Options: Bluetooth hands-free calling, audio streaming, USB port for media playback and charging. 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,750 miles or 3 months (severe driving) / 7,500 miles or 7.5 months (normal driving). Engine Air Filter: Inspect every 15,000 miles, replace as needed. Replace every 30,000 miles under normal conditions. Cabin Air Filter: Replace every 15,000 miles or annually. Spark Plugs: Replace every 30,000 miles (NGK SILFR6A iridums recommended). Coolant Flush: Initial flush at 60,000 miles, then every 30,000 miles thereafter. Subaru Super Coolant (Blue). Fluid Specifications Engine Oil Type: 5W-30 Synthetic (API SN or higher) Engine Oil Capacity: 5.1 US Quarts (4.8 Liters) with filter change Brake Fluid...