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The exhaust gas recirculation (EGR) system on your Ford Focus moves some of the exhaust back to the cylinders, replacing some of the combustible oxygen with nitrogen gas. This helps lower cylinder temperature and increases engine efficiency. The EGR valve opens and closes when signalled to allow exhaust gas to flow into the intake, and is sealed against the intake using an EGR valve gasket. When the EGR valve gasket on your Focus fails, it can lead to a leak around the valve, resulting in air from outside of the engine being pulled in. This can cause a loss of power, rough idle, or your Check Engine light may come on. If you need a replacement EGR valve or valve gasket for your Ford Focus, shop O'Reilly Auto Parts for all the EGR system parts you need to keep your engine running at its best.