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 MANAGEMENTEMISSION CONTROL SYSTEMSCATALYTIC CONVERTERCATALYST SHIELDSERVICE AND REPAIR
2009 Chevrolet Impala V6-3.9L
Catalyst Shield: Service and Repair
2009 Chevrolet Impala V6-3.9LSECTION Service and Repair
Catalytic Converter Heat Shield Replacement
Removal Procedure
1. Remove the catalytic converter. Refer to Catalytic Converter Replacement (With LZE, NU6 and PZEV) (Service and Repair).
2. Remove the heated oxygen sensor (HO2S) wiring harness from the clips on the catalytic converter heat shield.
3. Drill out the catalytic converter heat shield rivets.
4. Remove the catalytic converter heat shield.
Installation Procedure
1. Position the catalytic converter heat shield to the underbody.
2. Install NEW catalytic converter heat shield rivets.
3. Install the HO2S wiring harness from the clips on the catalytic converter heat shield.
4. Install the catalytic converter. Refer to Catalytic Converter Replacement (With LZE, NU6 and PZEV) (Service and Repair).
RENDER: 1.0x
NO RELATED
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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.