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 MANUALSCHEVROLET2008HHR L4-2.4LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSSENSORS AND SWITCHES - COMPUTERS AND CONTROL SYSTEMSKNOCK SENSORLOCATIONS
2008 Chevrolet HHR L4-2.4L
Knock Sensor: Locations
2008 Chevrolet HHR L4-2.4LSECTION Locations
Engine - Front (LNF)
1 - Fuel Rail Pressure Sensor (FPS) (LNF)
2 - Throttle Actuator Control (TAC) Module
3 - Turbo Bypass Valve Solenoid (LNF)
4 - Manifold Absolute Pressure (MAP) Sensor
5 - High Pressure Fuel Pump (LNF)
6 - Camshaft Position (CMP) Sensor Intake
7 - Knock Sensor (KS) 1 (LNF)
8 - Crankshaft Position (CKP) Sensor
9 - Engine Oil Pressure (EOP) Switch
10 - Starter
11 - A/C Compressor Clutch
12 - Generator
13 - Evaporative Emission (EVAP) Canister Purge Solenoid Valve
Front of the Engine (LE5)
1 - Fuel Injector 1
2 - Fuel Injector 2
3 - Fuel Injector 3
4 - Manifold Absolute Pressure (MAP) Sensor
5 - Fuel Injector 4
6 - Evaporative Emission (EVAP) Canister Purge Solenoid Valve
7 - Camshaft Position (CMP) Sensor - Intake
8 - Knock Sensor (KS)
9 - Engine Oil Pressure (EOP) Switch
10 - Crankshaft Position (CKP) Sensor
11 - Starter Solenoid
12 - Starter
13 - Intake Manifold
Front of the Engine (L61) (1 of 2)
1 - Fuel Injector 1
2 - Fuel Injector 2
3 - Fuel Injector 3
4 - Manifold Absolute Pressure (MAP) Sensor
5 - Fuel Injector 4
6 - Evaporative Emission (EVAP) Canister Purge Solenoid
7 - Camshaft Position (CMP) Sensor - Intake
8 - Knock Sensor (KS)
9 - Engine Oil Pressure (EOP) Switch
10 - Crankshaft Position (CKP) Sensor
11 - Starter Solenoid
12 - Starter
13 - Intake Manifold
Front of the Engine (L61) (2 of 2)
1 - Throttle Actuator Control (TAC) Module
2 - Evaporative Emission (EVAP) Canister Purge Solenoid
3 - Engine Oil Pressure (EOP) Switch
4 - Crankshaft Position (CKP) Sensor
5 - Knock Sensor (KS)
6 - Starter
7 - Starter Solenoid
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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.