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.
Knock Sensor: Service and Repair
2010 Chevrolet HHR L4-2.4LSECTION Service and Repair
Knock Sensor Replacement
Removal Procedure
1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle (Service and Repair).
2. Disconnect the knock sensor (KS) electrical connector (6).
3. Remove the KS bolt.
4. Remove the KS.
Installation Procedure
Note: Rotate the pigtail 90 degrees from vertical before securing the fastener.
1. Install the KS.
Caution: Refer to Fastener Caution (Fastener Caution).
2. Install the KS bolt.
Tighten the bolt to 25 Nm (18 lb ft).
3. Connect the KS electrical connector (6).
4. Lower the vehicle.
RENDER: 1.0x
NO RELATED
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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.