🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX/STI Year: 2012 Codes Chassis Code: GE/GH (WRX), GR/GV (STI) Engine Code Wrx: EJ255 (2.5L Turbocharged Flat-Four) Engine Code Sti: EJ257 (2.5L Turbocharged Flat-Four) 👋 Introduction Market Position Segment: Performance Compact / Sport Sedan Target Audience: Enthusiast drivers, rally fans, owners seeking to maintain or modify their WRX/STI Competitive Analysis Key Competitors: Mitsubishi Lancer Evolution, Volkswagen Golf GTI, Ford Focus RS (later generations) Key Features Performance Focus: Emphasizes the rally-bred heritage, turbocharged power, and Symmetrical All-Wheel Drive (SAWD) system. Manual Value: Provides authoritative information for DIY repairs, modifications, and in-depth understanding of the vehicle's complex systems. 📋 Manual Details Coverage Areas Primary Coverage: 2012 Subaru Impreza WRX and WRX STI Secondary Coverage: Potentially applicable to late 2011 and early 2013 models with minor variations Page Count Estimated Page Count: ~2000-3000 pages (typical for comprehensive factory service manuals) Manual Type Type: Factory Service Manual (FSM) / Repair Manual Language Language: English Format Format: Digital Download (PDF) 📖 Manual Coverage Systems Covered Powertrain: Engine (EJ255, EJ257), Turbocharger System, Fuel System, Ignition System, Cooling System, Exhaust System, Transmission (Manual and Automatic variants), Drivetrain (Symmetrical All-Wheel Drive, Differentials, Axles) Chassis: Suspension (Front MacPherson Strut, Rear Double Wishbone), Steering System, Brakes (ABS, VDC), Wheels and Tires Electrical: Battery, Charging System, Starting System, Lighting, Instrumentation, HVAC Controls, Power Accessories, Engine Control Module (ECM), Body Control Module (BCM), Audio System, SRS (Airbag) System Body: Exterior Body Panels, Doors, Windows, Locks, Interior Trim, Seating, Safety Restraints Procedures Included Maintenance: Scheduled Maintenance (Oil Changes, Filter Replacements, Fluid Checks), Tune-ups, Inspections Repair: Component Removal and Installation, Overhauls, Adjustments, Troubleshooting and Diagnosis Diagnostics: OBD-II Diagnostic Codes, Diagnostic Procedures for all major systems, Wiring Diagrams, Component Testing Technical Depth Depth: Comprehensive, covering basic maintenance to complete engine and transmission rebuilds. Includes detailed diagnostic trees and specifications for all repair procedures. 📊 Manual Specifications File Format File Type: PDF Searchability: Searchable text content for quick information retrieval Print Quality Image Resolution: High-resolution illustrations, diagrams, and photographs Binding Type Binding: N/A (Digital Download) Paper Type Paper Quality: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Type Wrx: 2.5L DOHC 16-Valve Turbocharged Boxer (EJ255) Type Sti: 2.5L DOHC 16-Valve Turbocharged Boxer (EJ257) Performance Horsepower Wrx: 265 hp @ 6000 rpm Torque Wrx: 244 lb-ft @ 4000 rpm Horsepower Sti: 305 hp @ 6000 rpm Torque Sti: 290 lb-ft @ 4000 rpm Fuel System Injection Type: Sequential Multi-Port Fuel Injection (MPI) with Top-Feed Injectors Fuel Grade Recommendation: Premium Unleaded (91 Octane or higher) Engine Management ECU Type: Denso ECU (Specific model numbers will be detailed in the manual) Cooling System Coolant Type: Subaru Super Coolant (Blue) or equivalent silicate-free, long-life coolant Turbocharger Type Wrx: Mitsubishi TD04L-13T (approx.) Type Sti: IHI VF48 🔧 Transmission Standard Type Wrx: 5-Speed Manual Type Sti: 6-Speed Manual (TY856WB1AA) Optional Automatic Transmission: No automatic transmission offered for WRX/STI variants in this model year. Features Drivetrain Layout: Symmetrical All-Wheel Drive (SAWD) with Front Helical Limited-Slip Differential (LSD) and Rear Viscous Coupling LSD (WRX), Front Helical LSD, DCCD (Driver Controlled Center Differential) and Rear Helical LSD (STI) Fluid Specifications Manual Gear Oil Spec: GL-4 75W-90 for front and rear differentials, GL-4 75W-90 for transfer case and transmission (specific Subaru specs may differ, consult manual) 📐 Dimensions Exterior Wheelbase: 103.3 inches (2624 mm) Length: 173.8 inches (4415 mm) Width: 70.1 inches (1780 mm) Height: 57.7 inches (1465 mm) Wheel Bolt Pattern: 5x114.3 mm (5x4.5 inches) Wheel Size: 17x8.0 inches (WRX), 18x8.5 inches (STI) Tire Size Wrx: 235/45R17 Tire Size Sti: 245/40R18 Weights Curb Weight Wrx: ~3200-3300 lbs (1450-1500 kg) Curb Weight Sti: ~3350-3450 lbs (1520-1565 kg) 🛡️ Safety Features Ratings NHTSA Front Impact: 5-Star (2012 Model) IIHS Top Safety Pick: Top Safety Pick (2012 Model) Active Features Vehicle Dynamics Control: Standard (VDC) with selectable modes, includes yaw rate, lateral acceleration, and brake pressure sensors. Traction Control: Standard Anti Lock Brakes: Standard (ABS) Passive Features Airbags: Front, Front Side-Impact, Side Curtain Airbags Seat Belts: Pretensioner and Force Limiter Front Seatbelts, Three-Point Rear Seatbelts Child Seat Anchors: LATCH System (Lower Anchors and Tethers for CHildren) 💡 Technology Features Infotainment Audio System: Standard AM/FM/CD/MP3 player with auxiliary input. Higher trims may feature Rockford Fosgate audio, Bluetooth, and navigation. Instrument Cluster: Features tachometer, speedometer, multi-function display (fuel economy, trip computer, etc.). STI may have additional performance gauges. Driver Assistance Cruise Control: Standard electronic cruise control. Keyless Entry: Standard Connectivity Bluetooth: Optional, depending on trim level and audio system. 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,750 miles or 6 months (severe driving) / 7,500 miles or 12 months (normal driving) - *Consult manual for specific recommendations based on driving conditions.* Engine Air Filter: Inspect every 15,000 miles, replace as needed or at ~30,000 miles. Cabin Air Filter: Replace every 15,000 miles or 12 months. Spark Plugs: Replace approximately every 60,000...