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.

2021 Toyota 4Runner TRD ProFACTORY OEM SERVICE PROCEDURE

Removal [08/2015 - ]: Procedure

REMOVE CYLINDER HEAD SUB-ASSEMBLY (for Bank 1)
1. Remove the cylinder head (Refer to REMOVAL [08/2015 - ] ).

REMOVE NO. 1 WATER OUTLET PIPE

Detach the 3 wire harness clamps.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Remove the 2 nuts, bolt and water outlet pipe.

REMOVE KNOCK SENSOR

Disconnect the 2 sensor connectors.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Remove the 2 bolts and 2 sensors.

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.