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.
2012 Chevrolet Sonic L4-1.8LFACTORY OEM SERVICE PROCEDURE
Knock Sensor: Service and Repair
Knock Sensor Replacement
Removal Procedure
1. Disconnect the negative cable from the battery. Refer to Battery Negative Cable Disconnection and Connection Battery Negative Cable Disconnection and Connection.
2. Remove the 2 intake manifold bracket bolts (2, 3).
3. Unclip the wiring harness.
4. Remove the intake manifold bracket (1).
5. Remove the sensor bolt (1).
6. Disconnect the electrical wiring harness connector.
7. Remove the knock sensor (2) from the bracket (3).
Installation Procedure
1. Install the knock sensor (2) to the bracket (3).
Caution:
Refer to Fastener Caution Fastener Caution
2. Install the sensor bolt (1) and tighten to 20 Nm (15 lb ft).
3. Connect the electrical wiring harness connector.
4. Install the intake manifold bracket (1).
5. Clip in the wiring harness to the bracket.
6. Install the 2 intake manifold bracket bolts (2, 3) and tighten to 8 Nm (71 lb in).
7. Connect the negative cable to the battery. Refer to Battery Negative Cable Disconnection and Connection Battery Negative Cable Disconnection and Connection.
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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