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
Drive Cycle S
| DTC | Item | Condition | Number of driving cycles on the detecting condition |
|---|---|---|---|
| P0246 | TURBOCHARGER/SUPERCHARGER WASTEGATE SOLENOID "A" HIGH | - | 1 |
| P04AD | EVAP SYSTEM (CPC) PURGE CONTROL VALVE "B" CIRCUIT HIGH | - | 2 |
| P0851 | PARK/NEUTRAL SWITCH INPUT CIRCUIT LOW | - | 2 |
| P0852 | PARK/NEUTRAL SWITCH INPUT CIRCUIT HIGH | - | 2 |
WARNING:
When performing the drive cycle S on the public road, be very careful of the traffic condition and the safe driving must be the high priority.
- Using the Subaru Select Monitor, perform the clear memory for «Engine». Refer to ENGINE (DIAGNOSTICS) (STI)>CLEAR MEMORY MODE>OPERATION .
- Drive three times according to the drive pattern described below.
- Read the temporary code using the Subaru Select Monitor or general scan tool. Refer to ENGINE (DIAGNOSTIC) (STI)>READ DIAGNOSTIC TROUBLE CODE (DTC)>OPERATION .
Factory Service Tools
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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.