Segment:
Performance Compact Sedan / Hatchback
Target Audience:
Enthusiasts, performance drivers, DIY mechanics, professional technicians
Key Competitors:
Mitsubishi Lancer Evolution (discontinued), Volkswagen Golf GTI, Ford Focus RS, Honda Civic Type R
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
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
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
Depth:
Complete factory-level repair and diagnostic information, including detailed procedures, diagrams, and specifications for all major systems.
Type:
2.5L Turbocharged Boxer-4 (EJ257)
Horsepower:
305 hp @ 6000 rpm
Torque:
290 lb-ft @ 4000 rpm
Injection:
Multi-point fuel injection
Fuel Type:
Premium Unleaded Gasoline (91 octane or higher recommended)
Coolant Capacity:
8.2 Liters (8.7 US qt)
Oil Capacity:
5.1 Liters (5.4 US qt) with filter change
Oil Specification:
SAE 0W-30 (API SN or ILSAC GF-5)
NHTSA Overall Rating:
5-Star (for 2015 model year, general Impreza)
AWD:
Standard Symmetrical All-Wheel Drive
ABS:
Anti-lock Braking System
Vsc:
Vehicle Stability Control
TCS:
Traction Control System
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
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.
Backup Camera:
Standard rear-view camera.
Keyless Access:
Keyless Access with Push-Button Start.
Bluetooth:
Standard Bluetooth hands-free calling and audio streaming.
Si Drive:
Subaru Intelligent Drive with Intelligent (I), Sport (S), and Sport Sharp (S#) modes.
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.
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)
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.
Rally Roots:
Subaru's long and successful history in motorsports, particularly World Rally Championship (WRC).
Wrx Genesis:
Originally a homologation special for rallying, the WRX became a production performance model.
Sti Development:
STI (Subaru Tecnica International) variants represent the pinnacle of performance development, featuring upgraded engines, suspensions, and drivelines.
Va Generation:
The 2015 model year marked the introduction of the 'VA' chassis, a significant update from the previous 'GR/GV' generation. It moved to the wider Impreza platform, adopting a less aggressive hatchback-only design for WRX and introducing the sedan-only WRX STI.
Manufacturing Location:
Gunma Plant, Japan
Sales Success:
The WRX STI is a halo model for Subaru, consistently recognized by enthusiasts and automotive publications for its performance and rally-bred capabilities.
Performance Car Of The Year:
While specific awards vary by year and publication, the WRX STI platform has frequently been a contender and winner in 'Best Performance Car' categories.
Manufacturer Approval:
This is a genuine Factory Service Repair Manual, meaning it contains the official procedures and specifications approved by Subaru.
