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.
2009 Hummer H2 V8-6.2LFACTORY OEM SERVICE PROCEDURE
Knock Sensor 1 Replacement
Knock Sensor 1 Replacement
Removal Procedure
1. Lift and support the vehicle. Refer to Lifting and Jacking the Vehicle (Service and Repair).
2. Disconnect the engine wiring harness electrical connector (4) from knock sensor.
3. Remove the knock sensor bolt (739) and knock sensor (718).
Installation Procedure
Caution: Refer to Fastener Caution (Fastener Caution).
1. Position the knock sensor (718) to the engine block and install the knock sensor bolt (739). Tighten the bolt to 25 Nm (18 lb ft)
2. Connect the engine wiring harness electrical connector (4) to knock sensor.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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