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In a 2012 Ford Focus, you can locate the idle air control valve near the throttle body on the engine intake. Its role is to regulate the airflow into the engine when the car is idle, such as when you're stopped or parked. If you experience stalling at idle or difficulty starting the vehicle without pressing the gas, this could indicate a problem with the valve being stuck either open or closed. Typically, a check engine light will illuminate to alert you of issues with the valve, prompting you to replace the part.
The idle air control valve for the 2012 Ford Focus is located beside the throttle body.