Where is the Intake Air Temperature Sensor located on a 2003 Chevy Impala?

The Intake Air Temperature (IAT) sensor on a 2003 Chevy Impala is typically located within the air intake tube, somewhere between the air filter box and the throttle body. It's usually a small, two-wire sensor that's either mounted directly to the tube or incorporated into a mass airflow sensor (MAF) housing.

Because its exact location can vary slightly depending on the engine (3.4L, 3.8L), the best way to find it is to:

1. Consult a repair manual: A Chilton's or Haynes repair manual specific to your 2003 Chevy Impala will show you a diagram with the exact location.

2. Use an online parts diagram: Many websites like AutoZone, Advance Auto Parts, or RockAuto offer free online parts diagrams. Search for your vehicle and year, and find the diagram for the intake system. The IAT sensor will be shown there.

3. Visual inspection: Carefully examine the intake tube. Look for a small sensor with two wires connected to it. It might be a cylindrical or a flat-pack component. Be cautious when inspecting as the intake system contains hot air and moving parts when the engine is running.

Important Note: If you're trying to find it to replace it, it's often easier to locate it by tracing the wiring harness from the sensor connector back to the engine control module (ECM).