🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX / WRX STI Year: 2012 👋 Introduction Market Position Positioning: The Subaru Impreza WRX and WRX STI are performance-oriented compact sports sedans/hatchbacks, known for their turbocharged engines, all-wheel-drive systems, and rally racing heritage. This manual caters to owners and technicians seeking in-depth knowledge for maintaining and repairing these specialized vehicles. Competitive Analysis Competitors: Competes with vehicles like the Mitsubishi Lancer Evolution, Volkswagen Golf GTI, Ford Focus ST, and similar performance compacts. The WRX STI, in particular, stands out with its advanced symmetrical all-wheel-drive and driver-controlled center differential. Key Features Vehicle Highlights: Turbocharged boxer engines, Symmetrical All-Wheel Drive, sport-tuned suspension, performance brakes, driver-focused interiors, distinctive styling. 📋 Manual Details Coverage Areas Coverage Scope: Comprehensive repair and service for 2012 Subaru Impreza WRX and WRX STI models. Page Count Estimated Pages: Over 2000 pages (typical for factory service manuals of this era). Manual Type Type: Factory Service Manual (FSM) / Workshop Manual Language Language: English Format Format: Digital Download (PDF) 📖 Manual Coverage Systems Covered Engine Mechanical: Engine assembly, disassembly, inspection, repair, lubrication, cooling, fuel delivery, emissions control. Engine Performance: Engine control systems (ECU, sensors, actuators), ignition system, turbocharger system (WRX/STI specific). Transmission Drivetrain: Manual transmission (6-speed for STI, 5-speed for WRX), clutch system, all-wheel-drive system (center differential, rear differential), driveshafts, axles. Suspension Steering: Front and rear suspension components (struts, springs, control arms, sway bars), steering system (rack and pinion, power steering), wheel alignment specifications. Brakes: Brake system components (master cylinder, brake lines, calipers, pads, rotors), ABS system, parking brake. Electrical System: Battery, charging system (alternator), starting system, lighting, horn, wipers, power windows, power locks, instrument cluster, fuses, relays. Climate Control: HVAC system (heating, ventilation, air conditioning), refrigerant, components, operation, troubleshooting. Body Interior: Body panel removal/installation, interior trim, seats, airbags, doors, windows, glass, exterior trim. Diagnostics Troubleshooting: Diagnostic trouble codes (DTCs), symptom-based troubleshooting, wiring diagrams, component testing procedures. Procedures Included Routine Maintenance: Oil and filter changes, fluid checks and top-offs, air filter replacement, spark plug replacement, brake pad/rotor replacement, tire rotation. Major Repairs: Engine overhaul, transmission overhaul, clutch replacement, differential service, suspension component replacement, brake system overhaul, turbocharger service. Electrical Diagnostics: Wiring diagram interpretation, circuit testing, sensor troubleshooting, ECU diagnosis. Bodywork: Panel alignment, door/window adjustment, interior component removal and installation, basic body repair procedures. Engine Timing: Detailed procedures for checking and adjusting engine timing, including belt/chain replacement where applicable (though EJ engines use timing belts). Fuel System Diagnosis: Troubleshooting fuel injectors, fuel pump, fuel pressure regulator, and EVAP system. Includes fuel pressure specifications. Ignition System Diagnosis: Testing ignition coils, spark plugs, crankshaft position sensor, camshaft position sensor, and ignition timing verification. Cooling System Repair: Radiator service, water pump replacement, thermostat testing and replacement, heater core diagnosis and replacement. Turbocharger System Service: Detailed breakdown of the turbocharger, wastegate, blow-off valve, intercooler system, and related piping. Includes diagnostic flowcharts for boost leaks and performance issues. Drivetrain Component Rebuild: Instructions for rebuilding manual transmissions, front and rear differentials, and servicing the AWD coupling system. Includes detailed torque specifications and bearing preloads. ABS And Vsc Diagnosis: Troubleshooting ABS wheel speed sensors, ABS control module, yaw rate sensor, steering angle sensor, and VDC system faults. Includes bleeding procedures for the ABS modulator. Airbag System Service: Procedures for airbag module replacement, SRS warning light diagnosis, and safety precautions when working on the Supplemental Restraint System. Technical Depth Depth: Extremely high. Covers everything from basic fluid changes to complete engine and transmission rebuilds, including detailed diagnostic procedures and specifications. Diagnostic Tools: References diagnostic trouble codes (DTCs) and often refers to Subaru's proprietary diagnostic tool (e.g., Subaru Select Monitor - SSM) or compatible OBD-II scanners for advanced diagnostics. 📊 Manual Specifications File Format File Type: PDF Searchability: Searchable text for quick information retrieval. Indexing: Well-indexed with a table of contents and often an index for easy navigation. Print Quality Resolution: High resolution, suitable for printing individual pages or the entire manual. Binding Type Binding: Not applicable (digital format). Paper Type Paper Type: Not applicable (digital format). ⚙️ Engine Specifications Primary Engine Wrx Engine Code: EJ255 Configuration: 2.5L Turbocharged Boxer 4-cylinder Horsepower: 265 hp @ 6000 rpm Torque: 244 lb-ft @ 4000 rpm Primary Engine Sti Engine Code: EJ257 Configuration: 2.5L Turbocharged Boxer 4-cylinder (high-performance variant) Horsepower: 305 hp @ 6000 rpm Torque: 290 lb-ft @ 4000 rpm Fuel System Fuel Delivery: Sequential multi-point fuel injection (MPI) Fuel Type: Premium Unleaded Gasoline (91 octane or higher recommended) 🔧 Transmission Standard Wrx Type: 5-speed Manual Transmission Standard Sti Type: 6-speed Manual Transmission Features Drivetrain: Symmetrical All-Wheel Drive (AWD) with front helical limited-slip differential, rear mechanical limited-slip differential (WRX) and Driver Controlled Center Differential (DCCD) with front and rear limited-slip differentials (WRX STI). 📐 Dimensions Exterior Length Length: Approximately 179.9 inches Exterior Width Width: Approximately 70.7 inches Exterior Height Height: Approximately 58.1 inches Wheelbase...