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.
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HOMESERVICE MANUALSCHEVROLET2009IMPALA V6-3.9LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSSENSORS AND SWITCHES - COMPUTERS AND CONTROL SYSTEMSKNOCK SENSORLOCATIONS
2009 Chevrolet Impala V6-3.9L
Knock Sensor: Locations
2009 Chevrolet Impala V6-3.9LSECTION Locations
Powertrain Component Views
Front of the Engine (LZE-3.5L Flex Fuel/LZ4-3.5L Gas/LZG-3.9L Flex Fuel)
1 - Camshaft Position (CMP) Sensor
2 - Knock Sensor (KS) 2
3 - Engine Oil Pressure (EOP) Sensor
4 - Camshaft Position (CMP) Actuator Solenoid Valve
Rear of the Engine (LZE-3.5L Flex Fuel/LZ4-3.5L Gas/LZG-3.9L Flex Fuel)
1 - Throttle Body
2 - Ignition Control Module (ICM)
3 - Heated Oxygen Sensor (HO2S) 1
4 - Engine Coolant Heater
5 - Engine Oil Level Switch
6 - Crankshaft Position (CKP) Sensor
7 - Knock Sensor (KS) 1
RENDER: 1.0x
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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.