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.
2018 Subaru WRX STIFACTORY OEM SERVICE PROCEDURE
Check Si-Drive (SUBARU Intelligent Drive) System: Notes
Diagnosis:
SI-DRIVE mode does not switch.
CAUTION:
Note that SI-DRIVE system operates the following controls when it switches the modes.
- Switches to S (Sport) mode when turning the engine OFF in S (Sport) or S# (Sport sharp) mode and then turning the engine ON again.
- Switches to I (intelligent) mode when turning the engine OFF in I (intelligent) mode and then turning the engine ON again.
- Switches to S (Sport) when the malfunction indicator light illuminates while the engine is running. In this case, Cannot switch to S# (Sport Sharp) or I (Intelligent) mode.
- Cannot switch to S# (Sport Sharp), when engine coolant temperature tells that overheating may occur. Switches to S (Sport) while driving in S# (Sport sharp) mode.
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.