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.
2017 Subaru Legacy 2.5iFACTORY OEM SERVICE PROCEDURE
General Scan Tool
NOTE:
For detailed operation procedures, refer to the general scan tool operation manual.
- Perform the Clear Memory Mode. Ref. to MODE $04 (CLEAR/RESET EMISSION-RELATED DIAGNOSTIC INFORMATION) , OPERATION, General Scan Tool.
- Read the diagnostic trouble code (DTC) and check that no DTC is displayed. Ref. to
MODE $07 (INITIAL EMISSION-RELATED POWERTRAIN DTC) , OPERATION, General Scan Tool.NOTE: If the DTC is displayed on the screen, the trouble is still present. Perform the diagnosis using "Diagnostic Procedure with Diagnostic Trouble Code (DTC)". Ref. to DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC) . After solving the DTC, repeat from step 1
- Start the engine, and run the engine at idle for 10 seconds or more.
- Read the diagnostic trouble code (DTC) and check the DTC. Ref. to MODE $07 (INITIAL EMISSION-RELATED POWERTRAIN DTC) , OPERATION, General Scan Tool.
NOTE:
If the DTC is displayed on the screen, the trouble is still present. Perform the diagnosis using "Diagnostic Procedure with Diagnostic Trouble Code (DTC)". Ref. to
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
. After solving the DTC, repeat from step 1
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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