How do you change the upstream o2 sensor
the check engine light is on and a mechanic put a machine on it an it detected the upstream o2 sensor
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Sheila McGriff, the front sensor, located in exhaust manifold, it is accessible from top of engine after first removing the exhaust manifold heat shield. You will need a crow's foot socket (7/8") in order to remove the sensor. They are available at any parts store. Check this video for more instructions. Hope this helps, good luck
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