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.
2009 Chevrolet Impala V6-3.9LFACTORY OEM SERVICE PROCEDURE
Air Flow Meter/Sensor: Service and Repair
Mass Airflow Sensor with Intake Air Temperature Sensor Replacement
Removal Procedure
1. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement (Service and Repair).
2. Disconnect the mass air flow/intake air temperature (MAF/IAT) sensor electrical connector (3).
3. Remove the MAF/IAT sensor bolts.
4. Remove the MAF/IAT sensor from the air cleaner housing.
5. Remove the MAF/IAT sensor seal, if necessary.
Installation Procedure
1. Install the MAF/IAT sensor seal, if necessary.
2. Install the MAF/IAT sensor to the air cleaner housing.
Caution: Refer to Fastener Caution (Fastener Caution).
3. Install the MAF/IAT sensor bolts.
Tighten the bolts to 10 Nm (89 lb in).
4. Connect the MAF/IAT sensor electrical connector (3).
5. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement (Service and Repair).
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.