🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2012 Chassis Code: GVB/GVF Codes Engine Code: EJ257 👋 Introduction Market Position Vehicle Segment: Compact Performance Sedan/Hatchback (WRC homologation special). Target Audience: Enthusiasts, performance drivers, DIY mechanics, tuners. Competitive Analysis Key Competitors: Mitsubishi Lancer Evolution, Ford Focus RS, Volkswagen Golf R, Subaru WRX (non-STI). Key Features Performance Focus: Legendary turbocharged Boxer engine, Symmetrical All-Wheel Drive, advanced DCCD, performance-tuned suspension, powerful Brembo brakes. Rally Heritage: Direct lineage from Subaru's World Rally Championship success, translating into robust construction and track-capable performance. 📋 Manual Details Coverage Areas Manual Type: Factory Service Manual (WSM) Language: English Format: Digital Download (likely PDF) Page Count Estimated Page Count: 1500+ 📖 Manual Coverage Systems Covered Engine Systems: Engine mechanical, lubrication, cooling, fuel injection, ignition, emissions control, engine management (ECU), turbocharger system, intercooler. Drivetrain Systems: Manual transmission, all-wheel drive system (Symmetrical AWD), center differential control (DCCD), clutch, differentials (front and rear), driveshafts, CV joints. Chassis Systems: Suspension (front and rear), steering system, power steering, braking system (ABS, EBD, Brembo brakes), wheel alignment. Electrical Systems: Battery, charging system, starting system, lighting (headlights, taillights, interior), instruments and gauges, power accessories (windows, locks, mirrors), body control module (BCM), fuse and relay locations, wiring diagrams. Body And Interior: Body panels, doors, hood, trunk, bumpers, glass, interior trim, seats, HVAC system, airbags, seat belts. Procedures Included Maintenance Procedures: Scheduled maintenance (oil changes, filter replacements, spark plugs, timing belt/chain inspection, brake fluid flush), fluid level checks, tire rotation. Diagnostic Procedures: Troubleshooting guides for common symptoms, OBD-II diagnostic codes, sensor testing, actuator testing, electrical system diagnostics. Repair Procedures: Engine overhaul, transmission rebuild, brake caliper replacement, suspension component replacement, steering rack repair, electrical component replacement, body panel repair. Special Tool Procedures: Identification and use of specialized tools required for specific repairs (e.g., timing belt tools, suspension alignment tools). Technical Depth Depth Of Coverage: Comprehensive, covering from basic maintenance to complete engine and transmission overhauls. Includes detailed schematics, torque specifications, and diagnostic flowcharts. 📊 Manual Specifications File Format File Type: PDF (Portable Document Format) Searchability: Likely searchable text for quick information retrieval. Print Quality Print Readability: Designed for clarity and easy reading, suitable for printing. Binding Type Binding Style: Not applicable for digital download; assumes user prints and binds. Paper Type Paper Quality Recommendation: Standard printer paper suitable for workshop environment; higher quality paper recommended for printing diagrams and schematics. ⚙️ Engine Specifications Primary Engine Engine Type: 2.5L Turbocharged Horizontally-Opposed (Boxer) 4-Cylinder DOHC Engine Displacement Cc: 2457 Performance Horsepower Hp: 305 Torque Lb Ft: 290 Fuel System Fuel Delivery: Multi-Point Fuel Injection (MPI) with top-feed injectors. Recommended Fuel: Premium Unleaded Gasoline (91 octane or higher). Engine Management Engine Control Unit: Subaru Engine Control Unit (ECU) with comprehensive sensor inputs. 🔧 Transmission Standard Transmission Type: 6-Speed Manual Transmission Optional Optional Transmission: N/A for WRX STI trim in 2012 Features Dccd: Driver Controlled Centre Differential (DCCD) with manual and automatic modes. Differential Type: Front helical limited-slip differential, Rear mechanical limited-slip differential. 📐 Dimensions Exterior Wheelbase Inches: 103.2 Length Inches: 179.5 Width Inches: 70.7 Height Inches: 58.1 Weights Curb Weight Lbs: 3373 Gross Vehicle Weight Rating Gvwr Lbs: 4430 Wheels And Tires Standard Wheel Size: 18 x 8.5 inches Standard Tire Size: 245/40R18 Bolt Pattern: 5x114.3 🛡️ Safety Features Ratings NHTSA Front Crash Rating: 5-Star IIHS Crash Test Rating: Good (for frontal offset, side impact, roof strength) Active Features ABS: Anti-lock Braking System (ABS) Ebd: Electronic Brake-force Distribution (EBD) Traction Control: Vehicle Dynamics Control (VDC) - includes Traction Control System (TCS) Passive Features Airbags: Driver and front passenger airbags, front side-impact airbags, side-curtain airbags. Seat Belts: 3-point front seat belts with pretensioners and force limiters, 3-point rear seat belts. Child Seat Anchors: LATCH (Lower Anchors and Tethers for CHildren) system. 💡 Technology Features Infotainment Infotainment System: Standard AM/FM/CD/MP3 audio system with auxiliary input. Optional navigation system may be available. Speaker System: Typically 4 or 6 speaker system. Driver Assistance Cruise Control: Standard electronic cruise control. Keyless Entry: Standard keyless entry with alarm system. Connectivity Bluetooth: May be available on higher trims or as an accessory. 🔧 Maintenance Service Intervals Oil Change Interval Miles: Typically 3,000-5,000 miles or 3-6 months, depending on driving conditions (severe vs. normal). Engine Air Filter Replacement: Every 15,000-30,000 miles, or as needed based on inspection. Spark Plug Replacement: Approx. 30,000-60,000 miles, depending on plug type (Iridium recommended). Timing Belt Maintenance: For EJ257, it's a timing chain, which generally does not require replacement unless issues arise. The manual will detail inspection procedures. Fluid Specifications Engine Oil Type: SAE 5W-30 Synthetic or Semi-Synthetic (refer to owner's manual for specific API/ILSAC ratings). Engine Oil Capacity Quarts: Approximately 5.1 quarts (4.8 liters) with filter change. Coolant Type: Subaru Super Coolant (blue) or equivalent silicate-free, long-life coolant. Transmission Fluid Type: Subaru Extra-S Gear Oil (75W-90 GL-5) or equivalent. Differential Fluid...