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 BaseFACTORY OEM SERVICE PROCEDURE
Section 12 (Engine Control System (Diagnostics) (General) (STI))
WARNING: This page is about a different variant/trim than selected.
- Diagnostic Procedure without Diagnostic Trouble Code (DTC)
- Check Si-Drive (SUBARU Intelligent Drive) System
- Notes
- Si-Drive Mode Indication Does Not Change And Modes Do Not Switch After Switching Si-Drive Modes
- When The Si-Drive Mode Is Changed, "S", "I" Or "S#" Flashes In Combination Meter Si-Drive Mode Display In Approx. 5 Seconds
- "S#", "I" Or "S" Blinks On Si-Drive Mode Display In The Combination Meter After Switching Si-Drive Modes
- Check Si-Drive (SUBARU Intelligent Drive) System
- General Diagnostic Table
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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