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The idle air control valve in a 2009 Ford Focus is situated on the front driver side of the engine below the throttle body. It regulates airflow into the engine when the car is idling to maintain smooth operation. Signs of a faulty valve include rough idling and the engine stalling when slowing down or coming to a stop. To replace it, simply disconnect the electrical connection and remove the two 8mm bolts. A new valve can be purchased for around $55, depending on the store. This is a straightforward task that should take no more than 30 minutes, but a professional shop or dealer might charge between $50 to $70 per hour for labor if you prefer to have them do the replacement for you.
In a Ford Focus from 2009, you can find the idle air control valve positioned on the intake manifold.