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Where is the IAT sensor plug on a 2003 mustang gt?

The Intake Air Temperature (IAT) sensor on a 2003 Mustang GT is located in the air intake tube, usually somewhere between the air filter housing and the throttle body. It's a small sensor with a single electrical connector.

Because the exact placement can vary slightly depending on specific modifications to the intake system, you'll need to visually inspect the intake tubing. Look for a small, usually black, sensor with a single wire harness plugged into it. Tracing the harness will often lead you to it if it's not immediately obvious. A shop manual or online diagrams specific to a 2003 Mustang GT's intake system would be helpful for a precise location.