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.
2004 Chevrolet Impala LSFACTORY OEM SERVICE PROCEDURE
Removal Procedure
CAUTION:
Hot engine coolant may cause severe burns. Although the cooling system has been drained, coolant still remains in the engine water jacket. This coolant will drain with the removal of the knock sensor.
- Remove the transaxle. Refer to TRANSMISSION REPLACEMENT .
- Drain the cooling system. Refer to Draining and Filling Cooling System in Engine Cooling.
- Remove the bolts (2) from the knock sensor heat shield (1).
- Disconnect the knock sensor electrical connector (3) from the knock sensor.
- Remove the knock sensor (4).
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.
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