This comprehensive workshop service repair manual provides detailed instructions and illustrations for the 2012-2014 Subaru Impreza G3 WRX STI. Covering both the 4-door and 5-door models, including WRX, WRX-S, STI-S, and SE trims, this manual is your ultimate resource for all your repair and maintenance needs. The manual covers both the 2.5L Turbo 4-cylinder DOHC and 2.5L High Power Turbo 4-cylinder DOHC engines, offering in-depth information on a wide range of systems, including: * **General Information:** Provides an overview of the vehicle, its specifications, and important safety information. * **Airbag System:** Detailed diagnostics and repair procedures for the airbag system, ensuring safe and efficient operation. * **Auto Headlight Beam Leveler System:** Comprehensive coverage of the automatic headlight system for optimal visibility. * **Body Control System Diagnostics:** Provides troubleshooting and repair guidance for the vehicle's body control systems. * **Brake System:** Detailed information on brake system components, diagnostics, and repair procedures. * **Clutch System:** In-depth coverage of clutch system operation, troubleshooting, and repair techniques. * **Communication System:** Explains the workings of the communication system and provides diagnostic procedures. * **Cooling System:** Offers comprehensive information on cooling system components, maintenance, and repair. * **Cruise Control System:** Detailed explanation of the cruise control system, including diagnostics and repair methods. * **Differentials:** Provides detailed information on the differential systems, including diagnostics and repair procedures. * **Drive Shaft System:** Covers the drive shaft system, offering information on components, diagnostics, and repair methods. * **Emission Control Devices:** Offers thorough explanation of emission control systems and their operation. * **Engine Diagnostic System:** In-depth coverage of the engine diagnostic system, including troubleshooting and repair procedures. * **Engine Mechanical:** Detailed information on engine components, repair procedures, and maintenance. * **Entertainment System:** Offers information on the entertainment system, including diagnostics and repair methods. * **Exhaust System:** Comprehensive information on the exhaust system, covering components, diagnostics, and repair techniques. * **Exterior Body Panels:** Provides detailed information on exterior body panels, including repair and replacement procedures. * **Exterior and Interior Trim:** Covers the exterior and interior trim elements, offering guidance on repair and replacement. * **Front Suspension:** Comprehensive information on the front suspension system, including diagnostics and repair procedures. * **Fuel Injection and Fuel Systems:** Detailed information on fuel injection systems, including diagnostics and repair methods. * **Glass, Windows, and Mirrors:** Provides information on replacing and repairing glass, windows, and mirrors. * **HVAC System: Heater, Ventilator, and AC:** Covers the heating, ventilation, and air conditioning system, including diagnostics and repair procedures. * **Ignition System:** Explains the operation of the ignition system and provides diagnostics and repair procedures. * **Immobilizer Diagnostics:** Detailed information on the immobilizer system, including diagnostics and troubleshooting. * **Instrumentation and Driver Information:** Explains the operation of the instrument cluster and driver information systems. * **Intake and Induction:** Covers the intake and induction system, providing diagnostics and repair procedures. * **LAN System Diagnostics:** Explains the Local Area Network system and provides diagnostics and troubleshooting steps. * **Lighting System:** Offers information on the lighting system, covering diagnostics and repair methods. * **Lubrication System:** Explains the operation of the lubrication system and provides maintenance recommendations. * **Manual Transmission and Differential:** Covers the manual transmission and differential systems, offering information on components and repair procedures. * **Occupant Detection System Diagnostics:** Provides diagnostics and troubleshooting procedures for the occupant detection system. * **Parking Brake:** Covers the parking brake system, offering information on components, diagnostics, and repair procedures. * **Power Assisted System: Power Steering:** Explains the operation of the power steering system and provides diagnostics and repair methods. * **Rear Suspension:** Provides detailed information on the rear suspension system, including diagnostics and repair procedures. * **Seat Belt System:** Covers the seat belt system, offering information on components, diagnostics, and repair procedures. * **Security and Locks:** Explains the operation of the security and lock systems and provides diagnostics and repair procedures. * **Seats System:** Provides information on the seat system, covering adjustment, repair, and replacement. * **Speed Control System:** Covers the speed control system, offering information on components, diagnostics, and repair methods. * **Starting and Charging System:** Explains the operation of the starting and charging systems and provides diagnostics and repair procedures. * **Transfer Case:** Offers information on the transfer case, including diagnostics and repair methods. * **Transmission Control System:** Covers the transmission control system, providing diagnostics and repair procedures. * **Vehicle Dynamics Control (VDC):** Explains the operation of the VDC system and provides diagnostics and repair procedures. * **Wheel and Tire System:** Provides information on the wheel and tire system, covering maintenance, diagnostics, and repair methods. * **Wiper and Washer Systems:** Offers information on the wiper and washer systems, covering diagnostics and repair methods. * **Wiring Diagrams:** Includes detailed wiring diagrams for easy troubleshooting and repair. This manual is your essential resource for keeping your Subaru Impreza G3 WRX STI running smoothly. With its comprehensive coverage, detailed illustrations, and step-by-step instructions, you can perform repairs and maintenance with confidence, saving time and money.

The Subaru Impreza G3 WRX STI, produced from 2012 to 2014, is a high-performance sports sedan that embodies the spirit of Subaru's rally heritage. Building upon the legacy of its predecessors, the G3 WRX STI boasts a potent 2.5-liter turbocharged four-cylinder Boxer engine generating 305 horsepower and 290 lb-ft of torque. This power is channeled through a six-speed manual transmission and Subaru's renowned Symmetrical All-Wheel Drive system, delivering exhilarating performance and precise handling. The STI's suspension has been meticulously tuned for track-ready capabilities, featuring upgraded dampers, stiffer springs, and a larger anti-roll bar for exceptional responsiveness and cornering prowess. Complementing the mechanical upgrades are distinctive styling cues that set the STI apart, including a more aggressive front fascia, a rear wing for enhanced aerodynamics, and 18-inch alloy wheels wrapped in high-performance tires. Inside the cabin, the WRX STI offers a driver-focused environment with supportive sport seats, a leather-wrapped steering wheel, and a comprehensive instrument cluster. Standard features include a touchscreen infotainment system with Bluetooth connectivity, a rearview camera, and a powerful sound system. Beyond performance, the G3 WRX STI also prioritizes safety with its comprehensive suite of airbags, electronic stability control, and anti-lock brakes. This generation of the WRX STI cemented its position as a formidable contender in the performance car segment, offering a compelling blend of power, handling, and practicality. The 2012-2014 Impreza G3 WRX STI continues to appeal to enthusiasts seeking an engaging and capable driving experience, making it a cherished and sought-after model within the Subaru lineup.