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
Engine Control System (Diagnostics - Introduction) (STI)
- Basic Diagnostic Procedure
- Check List for Interview
- General Description
- Electrical Component Location
- Engine Control Module (ECM) I/O Signal
- Data Link Connector
- General Scan Tool
- Operation
- How To Use General Scan Tool
- Mode $01 (Current Powertrain Diagnostic Data)
- Mode $02 (Powertrain Freeze Frame Data)
- Mode $03 (Emission-Related Powertrain DTC)
- Mode $04 (Clear/Reset Emission-Related Diagnostic Information)
- Mode $06 (Request On-Board Monitoring Test Results For Continuously Monitored Systems)
- Mode $07 (Initial Emission-Related Powertrain DTC)
- Mode $08 (Request Control For On-Board System, Test, And Component)
- Mode $09 (Request Vehicle Information)
- Mode $0A (Emission-Related DTC (With Permanent Status))
- Operation
- Subaru Select Monitor
- Read Diagnostic Trouble Code (DTC)
- Inspection Mode
- Drive Cycle
- Procedure
- Notes
- Preparation For Drive Cycle
- Drive Cycle A
- Drive Cycle B
- Drive Cycle E
- Drive Cycle F
- Drive Cycle G
- Drive Cycle H
- Drive Cycle I
- Drive Cycle J
- Drive Cycle N
- Drive Cycle O
- Drive Cycle P
- Drive Cycle R
- Drive Cycle S
- Drive Cycle T
- Drive Cycle V
- Drive Cycle W
- Drive Cycle X
- Drive Cycle Y
- Drive Cycle Z
- Drive Cycle Aa
- Drive Cycle Ab
- Procedure
- Clear Memory Mode
- Active Test
- Malfunction Indicator Light
- Diagnostics for Engine Starting Failure
- Diagnostic Procedure for Subaru Select Monitor Communication
- List of Diagnostic Trouble Code (DTC)
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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