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Where is bank 1 oxygen sensor on a 1999 ford explorer sport 4.0 ohv?

The bank 1 oxygen sensor on a 1999 Ford Explorer Sport 4.0 OHV is located on the passenger side of the engine, just below the exhaust manifold. It is a small, cylindrical device with a wire coming out of it. The oxygen sensor is responsible for measuring the amount of oxygen in the exhaust gas, which is used by the engine computer to adjust the fuel mixture.