🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2015 Codes Chassis Code: VA Engine Code: EJ257 👋 Introduction Market Position Segment: Performance Compact Sedan / Hatchback Target Audience: Enthusiasts, performance drivers, DIY mechanics, professional technicians Competitive Analysis Key Competitors: Mitsubishi Lancer Evolution (discontinued), Volkswagen Golf GTI, Ford Focus RS, Honda Civic Type R Key Features Performance Focus: Symmetrical All-Wheel Drive, turbocharged boxer engine, performance-tuned suspension Rally Heritage: Direct lineage to Subaru's WRC (World Rally Championship) success Dccd: Driver Controlled Center Differential for adjustable torque distribution 📋 Manual Details Coverage Areas Comprehensive Coverage: Yes Page Count Estimated Page Count: Approximately 3500+ Manual Type Type: Factory Service Repair Manual Language Language: English Format Format: Digital (PDF) 📖 Manual Coverage Systems Covered Engine: Engine mechanical, engine electrical, cooling system, lubrication system, fuel system, exhaust system, emissions control Transmission: Manual transmission (TY856) service, clutch, driveline, AWD system (DCCD) Brakes: Brake system, ABS, brake fluid service, caliper and rotor replacement Suspension: Front and rear suspension, steering system, wheel alignment Electrical: Wiring diagrams, lighting, charging system, starting system, power windows, locks, diagnostics Body: Body panels, interior trim, doors, windows, bumpers, chassis and frame HVAC: Heating, ventilation, and air conditioning system Safety: Airbag system, seat belts, safety restraints Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, tune-ups Troubleshooting: Diagnostic trouble codes (DTCs), symptom-based troubleshooting guides Repair: Engine component replacement, transmission overhaul, brake caliper rebuild, suspension component replacement Installation: Component installation, accessory fitting, sensor replacement Specifications: Torque specifications, fluid capacities, clearance measurements, electrical resistance values Technical Depth Depth: Complete factory-level repair and diagnostic information, including detailed procedures, diagrams, and specifications for all major systems. 📊 Manual Specifications File Format Searchable Text: Yes Printable: Yes Print Quality Resolution: High (suitable for clear viewing of diagrams and text) Binding Type Binding: N/A (Digital PDF) Paper Type Paper Type: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Type: 2.5L Turbocharged Boxer-4 (EJ257) Performance Horsepower: 305 hp @ 6000 rpm Torque: 290 lb-ft @ 4000 rpm Redline: 7000 rpm Fuel System Injection: Multi-point fuel injection Fuel Type: Premium Unleaded Gasoline (91 octane or higher recommended) Cooling System Coolant Capacity: 8.2 Liters (8.7 US qt) Lubrication System Oil Capacity: 5.1 Liters (5.4 US qt) with filter change Oil Specification: SAE 0W-30 (API SN or ILSAC GF-5) 🔧 Transmission Standard Type: 6-speed Manual (TY856) Features Dccd Control: Driver Controlled Center Differential Fluid Specifications Manual Transmission Fluid: API GL-4 SAE 75W-90 (Subaru Genuine Gear Oil recommended) Fluid Capacities Manual Transmission Capacity: 2.5 Liters (2.6 US qt) 📐 Dimensions Exterior Length: 4,415 mm (173.8 in) Width: 1,795 mm (70.7 in) Height: 1,475 mm (58.1 in) Wheelbase: 2,650 mm (104.3 in) Ground Clearance: 135 mm (5.3 in) Weights Curb Weight: Approx. 1,525 kg (3,362 lbs) Gross Vehicle Weight Rating: 1,950 kg (4,299 lbs) 🛡️ Safety Features Ratings NHTSA Overall Rating: 5-Star (for 2015 model year, general Impreza) Active Features AWD: Standard Symmetrical All-Wheel Drive ABS: Anti-lock Braking System Vsc: Vehicle Stability Control TCS: Traction Control System Passive Features Airbags: Driver and front passenger airbags, side-curtain airbags, front side airbags Seatbelts: 3-point front and rear seatbelts with pretensioners Child Anchors: LATCH (Lower Anchors and Tethers for CHildren) system 💡 Technology Features Infotainment Head Unit: Standard 6.2-inch touch-screen infotainment system with Bluetooth connectivity, USB ports, and auxiliary input. Audio System: Available upgraded Harman Kardon audio system. Driver Assistance Backup Camera: Standard rear-view camera. Keyless Access: Keyless Access with Push-Button Start. Connectivity Bluetooth: Standard Bluetooth hands-free calling and audio streaming. Performance Tech Si Drive: Subaru Intelligent Drive with Intelligent (I), Sport (S), and Sport Sharp (S#) modes. 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,750 miles or 6 months, whichever comes first (severe driving conditions); 7,500 miles or 12 months (normal conditions). Engine Air Filter: Inspect every 7,500 miles, replace as needed or every 15,000 miles. Cabin Air Filter: Replace every 7,500 miles or 12 months. Spark Plugs: Iridium spark plugs, typically replaced around 60,000 miles. Fluid Specifications Brake Fluid: DOT 3 or DOT 4 (Subaru DOT 3 Premium Brake Fluid recommended) Coolant: Subaru Super Coolant (Blue) or equivalent (50/50 mix with distilled water) Known Issues Piston Ring Land Failure: A known issue in some EJ257 engines, particularly under aggressive tuning or high heat, leading to loss of compression or oil consumption. The manual provides diagnostic procedures. Clutch Wear: Can be accelerated with aggressive driving. Manual provides clutch inspection and replacement procedures. Turbocharger Issues: Potential for wear or failure if oil is not changed regularly or if subjected to extreme heat cycling. Manual details inspection and potential replacement. Differential Fluid Changes: Regular replacement of front and rear differential fluids is crucial for drivetrain longevity. Manual specifies intervals and fluid types. 📚 Vehicle History Brand Heritage Rally Roots: Subaru's long and successful history in motorsports, particularly World Rally Championship (WRC). Model Evolution Wrx Genesis: Originally a...