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 Chevrolet Impala V8-5.3LFACTORY OEM SERVICE PROCEDURE
Knock Sensor: Service and Repair
Knock Sensor Replacement
Removal Procedure
1. Drain the cooling system. Refer to Cooling System Draining and Filling (9C1, 9C3 Static Fill) (Service and Repair)Cooling System Draining and Filling (LZE, LZ4, LGD Static Fill) (Service and Repair)Cooling System Draining and Filling (LZE, LZ4, LGD, 9C1, 9C3, GE47716 Fill) (Service and Repair).
2. Disconnect the left knock sensor electrical connector, if required.
3. Remove the left knock sensor bolt, if required.
4. Remove the left knock sensor, if required.
5. Disconnect the right knock sensor electrical connector (2), if required.
6. Remove the right knock sensor bolt, if required.
7. Remove the right knock sensor, if required.
Installation Procedure
1. Position the right knock sensor to the engine block, if required.
Caution: Refer to Fastener Caution (Fastener Caution).
2. Install the right knock sensor bolt, if required.
Tighten the bolt to 20 Nm (15 lb ft).
3. Connect the right knock sensor electrical connector (2), if required.
4. Position the left knock sensor to the engine block, if required.
5. Install the left knock sensor bolt, if required.
Tighten the bolt to 20 Nm (15 lb ft).
6. Connect the left knock sensor electrical connector, if required.
7. Fill the cooling system. Refer to Cooling System Draining and Filling (9C1, 9C3 Static Fill) (Service and Repair)Cooling System Draining and Filling (LZE, LZ4, LGD Static Fill) (Service and Repair)Cooling System Draining and Filling (LZE, LZ4, LGD, 9C1, 9C3, GE47716 Fill) (Service and Repair).
Factory Service Tools
Use the Manual With the Right Hardware
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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.