exhaust manifold gasket. on 2004 Ford Mustang

does a bad exhaust manifold gasket cause poor gas mileage?

Asked by for the 2004 Ford Mustang
Yes, because the fresh air hits the Oxygen Sensors and makes the car run REALLY RICH, which cuts about 40% off your mileage. You may also have a Check Engine Light on as well. This article explains about the Check Engine Light

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