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
2008 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
Important: Rotate the pigtail 90 degrees from vertical before securing the fastener.
1. Install the KS.
Notice: Refer to Fastener Notice (Fastener Notice) .
2. Install the KS bolt.
Tighten the bolt to 25 N.m (18 lb ft).
3. Connect the KS electrical connector (6).
4. Lower the vehicle.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.