Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2015 Subaru WRX STI Launch EditionFACTORY OEM SERVICE PROCEDURE
Fuel Injection System (STI)
- General Description
- Throttle Body
- Intake Manifold
- Engine Coolant Temperature Sensor
- Crankshaft Position Sensor
- Camshaft Position Sensor
- Knock Sensor
- Throttle Position Sensor
- Mass Air Flow and Intake Air Temperature Sensor
- Manifold Absolute Pressure Sensor
- Fuel Injector
- Tumble Generator Valve Assembly
- Tumble Generator Valve Actuator
- Oil Flow Control Solenoid Valve
- Wastegate Control Solenoid Valve
- Front Oxygen (A/F) Sensor
- Rear Oxygen Sensor
- SI-DRIVE (SUBARU Intelligent Drive) Selector
- Engine Control Module (ECM)
- Main Relay
- Oxygen Sensor Relay
- Electronic Throttle Control Relay
- Fuel Pump Relay
- Fuel Pump Control Unit
- Fuel
- Fuel Tank Protector
- Fuel Tank
- Fuel Filler Pipe
- Fuel Pump
- Fuel Level Sensor
- Fuel Sub Level Sensor
- Fuel Filter
- Pulsation Damper Assembly
- Pressure Regulator & Damper Assembly
- Fuel Delivery, Return and Evaporation Lines
- Fuel System Trouble in General
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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