🏷️ 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 Usp: All-wheel-drive performance, rally-bred heritage, turbocharged Boxer engine. Competitive Analysis Competitors: Mitsubishi Lancer Evolution (discontinued for this generation), Volkswagen Golf GTI, Ford Focus RS (later generation). Key Features Powertrain: EJ257 2.5L turbocharged Boxer engine, Symmetrical All-Wheel Drive, Driver Controlled Centre Differential (DCCD). Performance Enhancements: Large intercooler, performance exhaust, upgraded suspension components, Brembo brakes. 📋 Manual Details Coverage Areas All Models: Yes All Engines: Yes (specifically EJ257) All Trims: Yes Page Count Estimated Pages: 2500+ Manual Type Type: Workshop Repair Service Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine: Detailed diagnostics, overhaul, timing belt, cooling system, lubrication, fuel injection, turbocharger system, ECU mapping. Transmission: 6-speed manual (TY85) gearbox, clutch system, drivetrain components, AWD system (DCCD). Brakes: ABS, EBD, Brembo brake system (front and rear calipers, rotors, fluid), parking brake. Suspension: Front struts, rear shocks, coil springs, anti-roll bars, bushings, alignment specifications. Steering: Power steering system, steering rack, column, alignment. Electrical: Wiring diagrams, starter, alternator, battery, lighting, fuses, relays, ECUs, sensors, immobilizer. Bodywork: Exterior panels, interior trim, doors, windows, sunroof, structural components, corrosion protection. Climate Control: HVAC system, refrigerant, AC compressor, heater core, blower motor. Safety Systems: Airbag system, seatbelts, SRS module, occupant sensors. Procedures Included Maintenance: Scheduled maintenance intervals, oil changes, filter replacements, fluid checks and top-offs. Troubleshooting: Diagnostic flowcharts, fault code interpretation, symptom-based troubleshooting. Repair: Component removal and installation, overhaul procedures, specific repair techniques. Diagnostics: OBD-II diagnosis, sensor testing, ECU communication testing. Recalibration: Throttle body relearn, ECU reset procedures, ABS sensor calibration. Technical Depth Depth: Comprehensive: from basic fluid checks to full engine and transmission rebuilds. Detail Level: Highly detailed with torque specifications, clearances, and diagnostic parameters. 📊 Manual Specifications File Format Searchable Text: Yes Printable: Yes Resolution: High-resolution (suitable for printing). Print Quality Quality: N/A (Digital PDF) Binding Type Type: N/A (Digital PDF) Paper Type Type: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Engine Type: Horizontally opposed (Boxer), turbocharged, intercooled, DOHC, 16-valve, 4-cylinder Displacement: 2457 cc (2.5 Liters) Bore X Stroke: 99.5 mm x 80.0 mm Compression Ratio: 8.4:1 Performance Horsepower: 305 hp @ 6000 rpm Torque: 290 lb-ft @ 4000 rpm Fuel System Fuel Delivery: Sequential multi-point fuel injection with Electronic Throttle Control Fuel Type: Premium Unleaded Gasoline (91 octane or higher recommended) Turbocharger Type: Twin-scroll turbocharger Cooling System Coolant Capacity: Approx. 8.1 US quarts (7.7 liters) Coolant Type: Subaru Super Coolant (Blue) Lubrication Oil Capacity: Approx. 5.7 US quarts (5.4 liters) with filter Oil Type: SAE 0W-20 Synthetic (API SN or higher) 🔧 Transmission Standard Type: 6-speed Manual (TY85) Optional Type: None (STI models exclusively manual) Features Dccd: Driver Controlled Centre Differential (manual and auto modes). AWD System: Symmetrical All-Wheel Drive with front helical LSD and rear Torsen LSD. Fluid Specifications Manual Transmission Fluid Type: Subaru Extra Gear Oil (API GL-5, SAE 75W-90) Differential Fluid Front Type: Subaru Extra Gear Oil (API GL-5, SAE 75W-90) Fluid Capacities Manual Transmission Capacity: Approx. 3.3 US quarts (3.1 liters) 📐 Dimensions Exterior Length: 179.1 inches (4550 mm) Width: 70.7 inches (1795 mm) Height: 57.9 inches (1470 mm) Wheelbase: 104.1 inches (2645 mm) Weights Curb Weight: Approx. 3417 lbs (1550 kg) Gross Vehicle Weight Rating: Approx. 4560 lbs (2068 kg) Cargo Trunk Volume Sedan: 12.0 cu ft (340 L) Trunk Volume Hatchback: 21.7 cu ft (615 L) behind rear seats 🛡️ Safety Features Ratings NHTSA Overall: 5-Star (for applicable models/configurations) IIHS Top Safety Pick: Yes (for applicable models/configurations) Active Features Traction Control: Vehicle Dynamics Control (VDC) with yaw rate, lateral acceleration, and steering angle sensors. Braking Assist: Yes (integrated with ABS) Passive Features Airbags: Front dual-stage airbags, front side-impact airbags, curtain airbags, driver's knee airbag. Seatbelts: 3-point front and rear seatbelts with pretensioners and load limiters. 💡 Technology Features Infotainment System: Subaru Starlink infotainment system with touchscreen, AM/FM/CD, HD Radio, SiriusXM Satellite Radio, Bluetooth connectivity. Navigation: Optional navigation system. Driver Assistance Features: Rearview camera, optional EyeSight driver assistance system (on non-STI models, but relevant for the Impreza platform). STI focuses more on driver engagement. Connectivity Bluetooth: Standard for audio streaming and hands-free calling. Performance Tech Dccd: Driver Controlled Centre Differential offers adjustable torque split for various driving conditions and styles. Si Drive: Subaru Intelligent Drive allows selection of 'Sport', 'Sport Sharp', and 'Intelligent' modes for engine response, steering, and AWD system. 🔧 Maintenance Service Intervals Oil Change: Every 3,750 miles or 6 months (severe driving conditions), 7,500 miles or 12 months (normal driving conditions) - refer to manual for specific details. Air Filter Replacement: Every 15,000 miles or 12 months (severe driving conditions). Cabin Air Filter Replacement: Every 15,000 miles or 12 months. Spark Plug Replacement: Every 60,000 miles (NGK iridium recommended). Timing Belt Replacement: Refer to...