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.

2015 Subaru Forester 2.0XT PremiumFACTORY OEM SERVICE PROCEDURE

Engine Control System (Diagnostics) (H4DOTC): General Description: Preparation Tool

TOOL NUMBER	DESCRIPTION	REMARKS
1B023XG0	SUBARU SELECT MONITOR III KIT	Used for troubleshooting the electrical system.
18252AA000	CRANKSHAFT SOCKET	Used for rotating crankshaft.
18460AA030	CHECK BOARD	Used for measuring the ECM terminal voltage.

Fig 1: Identifying Subaru Select Monitor III Kit (ST1B023XG0)

Courtesy of SUBARU OF AMERICA, INC.

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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.