Where is the engine coolant temp sensor located on a 2002 Chevy Impala with 3.8 V6?

The Engine Coolant Temperature (ECT) sensor on a 2002 Chevy Impala with a 3.8L V6 is typically located on the cylinder head, near the thermostat housing. It's a relatively small sensor, often with a single wire connector.

However, precise location can vary slightly depending on the specific engine configuration. It's best to:

1. Consult a repair manual: A Haynes or Chilton repair manual specific to your year and model Impala will have diagrams showing the exact location.

2. Use an online parts diagram: Many auto parts websites (like AutoZone, Advance Auto Parts, etc.) allow you to select your vehicle's year, make, and model and view a parts diagram showing the ECT sensor placement.

3. Look at the engine visually: Once you've got a general idea from a diagram, carefully inspect the area around the thermostat housing on the cylinder head. Look for a sensor that resembles a small temperature probe with a single wire connector. Be cautious when looking around hot engine components.

Remember to let the engine cool completely before attempting any work near it.