This comprehensive Subaru Impreza service and repair manual covers models from 2001 to 2007, including the WRX STi. It's a detailed guide designed to help you understand and maintain your vehicle, whether you're a seasoned DIY enthusiast or a novice looking to tackle basic repairs. The manual provides in-depth information on a wide range of systems, including: * **Airbag System:** Learn about the safety features of your Subaru Impreza, including the airbag system and its components. * **HVAC Air Conditioning System:** Understand how your air conditioning system works, from the compressor to the vents, and find troubleshooting tips for common problems. * **Body Structure:** Discover the intricacies of your vehicle's bodywork, from the chassis to the panels, allowing you to identify potential issues and understand how to repair them. * **Cruise Control System:** Learn about the workings of the cruise control system, how to adjust it, and how to troubleshoot any malfunctions. * **Communication System:** Get familiar with the communication system, including the infotainment system, hands-free calling, and other features. * **Exterior Body:** Explore the various components of the exterior, from the bumpers and headlights to the doors and fenders. * **Exterior Interior Trim:** Find information on interior and exterior trim components, including their installation and maintenance. * **Glass Windows Mirrors:** Learn about the glass, windows, and mirrors, including their mechanisms, repair, and replacement. * **Instrument Driver Information:** Understand the instrument cluster and its various gauges, warning lights, and displays. * **Imomobilizer:** Find detailed information about the immobilizer system, its purpose, and how it works. * **Lighting System:** Learn about the headlights, taillights, interior lights, and other lighting features, including maintenance and repair. * **Seats Seatbelt System:** Understand the workings of the seat and seatbelt system, including adjustment, repair, and safety features. * **Security & Locks:** Discover the security features of your Subaru Impreza, including the locks, alarm system, and remote keyless entry. * **Sunroof:** Learn about the sunroof system and its operation, repair, and maintenance. * **Wiper & Washer System:** Find information on the windshield wiper and washer system, including its components, operation, and troubleshooting. * **ABS:** Dive into the anti-lock braking system (ABS), understanding its function, components, and troubleshooting steps. * **Brake System:** Explore the brake system in detail, including the discs, calipers, pads, and hydraulic system. * **Differentials:** Understand the differentials and their role in transferring power to the wheels. * **Drive Shaft:** Learn about the drive shaft, its function, and how to inspect and replace it. * **Front Suspension:** Dive into the front suspension system, including the struts, springs, and control arms. * **Parking Brake:** Familiarize yourself with the parking brake system, its mechanics, and how to adjust it. * **Power Steering:** Understand the power steering system, its components, and common troubleshooting procedures. * **Rear Suspension:** Explore the rear suspension system, including the shocks, springs, and control arms. * **Transfer Case:** Learn about the transfer case in 4WD models, its operation, and how to maintain it. * **Wheel & Tire:** Find detailed information on wheels and tires, including maintenance, repairs, and replacement. * **Cooling System:** Understand the cooling system, including the radiator, thermostat, and water pump. * **Emission Control:** Learn about the emissions control system, including catalytic converters and exhaust gas recirculation (EGR). * **Engine / Diagnostics:** Explore the engine in detail, from the cylinders and pistons to the timing system and the various sensors. This section also includes diagnostic information. * **Exhaust System:** Learn about the exhaust system, including the headers, muffler, and catalytic converter. * **Fuel Injection System:** Understand the workings of the fuel injection system, including the injectors, fuel pump, and fuel lines. * **Ignition System:** Explore the ignition system, including the spark plugs, ignition coils, and distributor. * **Lubrication System:** Learn about the lubrication system, including the oil pump, oil filter, and oil pan. * **Mechanical System:** Get an overview of the mechanical systems, including the transmission, engine, brakes, and suspension. * **Starting / Charging System:** Understand the starting and charging system, including the starter, battery, and alternator. * **Speed Control System:** Learn about the speed control system, including the cruise control and traction control systems. * **Automatic Transmission:** Understand the automatic transmission, including its operation, maintenance, and troubleshooting. * **Manual Transmission:** Explore the manual transmission, including gear selection, clutch operation, and maintenance. * **Clutch System:** Learn about the clutch system, including its components, operation, and how to replace it. * **Wiring Diagram:** Find detailed wiring diagrams for your Subaru Impreza, helping you troubleshoot electrical issues. This manual provides a comprehensive resource for understanding, maintaining, and repairing your Subaru Impreza.

The Subaru Impreza, a compact car known for its versatility and performance, has been a staple in the automotive world since its introduction in 1992. The 2002-2007 model years saw the introduction of the WRX STI, a high-performance variant that cemented the Impreza's status as a rally-bred icon. This specific model, the Subaru Impreza WRX STi, exemplified Subaru's commitment to performance engineering with a turbocharged 2.5-liter boxer engine that delivered impressive power, and a symmetrical all-wheel drive system that offered exceptional handling and traction in all conditions. Beyond its sporty demeanor, the Impreza also provided a comfortable and functional interior with a spacious cabin and practical cargo space, catering to both everyday driving and weekend adventures. This generation of Impreza, known for its distinctive design and innovative features, became a favorite among enthusiasts and everyday drivers alike, solidifying its place in automotive history. The Subaru Impreza's WRX STI variant, produced from 2002 to 2007, was a true performance machine, attracting drivers seeking a thrilling driving experience. This model, often referred to as the "Bugeye" due to its distinctive headlight design, featured a range of upgrades that enhanced its performance, handling, and styling. The WRX STI boasted a powerful 2.5-liter turbocharged boxer engine, generating 227 horsepower in its early years and later reaching 300 horsepower in the 2004-2007 model years. The car's performance was further amplified by its enhanced suspension, Brembo brakes, and an exceptional symmetrical all-wheel drive system that provided superior traction and control. Complementing its performance capabilities, the WRX STI featured cosmetic enhancements like a widebody kit, aggressive front and rear bumpers, and a rear spoiler, enhancing its presence and aggressive stance. This combination of power, handling, and style made the 2002-2007 WRX STI a coveted choice for driving enthusiasts and a testament to Subaru's commitment to performance engineering.