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.
2019 Subaru WRX STI S209FACTORY OEM SERVICE PROCEDURE
Throttle Body: Removal
- Disconnect the ground cable from battery.
- Lift up the vehicle.
- Remove the under cover. Refer to EXTERIOR/INTERIOR TRIM>FRONT UNDER COVER>REMOVAL .
- Drain approximately 3.0 L (3.2 US qt, 2.6 Imp qt) of coolant. Refer to COOLING (STI)>ENGINE COOLANT>REPLACEMENT>DRAINING OF ENGINE COOLANT .
- Remove the intercooler. Refer to INTAKE (INDUCTION) (STI)>INTERCOOLER>REMOVAL .
- Disconnect the connector (A) from the throttle position sensor, and the connector (B) from the manifold pressure sensor.
- Disconnect the engine coolant hose from throttle body.
- Remove the throttle body from the intake manifold.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.