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The primary sensor is on the manifold or on the exhaust pipe; late-model vehicles also have sensors farther downstream. Unplug the wire connection then spray a penetrating lubricant onto the threaded connection. Remove the old sensor with a flare-nut wrench or box-end wrench.
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Name-brand oxygen sensors come with a special electrically conductive anti-seize compound applied to the threads, so it's merely a matter of threading the new sensor into the void left by the old, worn one.
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While there's no torque value given for tightening the new oxygen sensor, treat it much like you would a spark plug. In other words, less is probably better here. Once it's snug, plug the connector into your car's factory wiring to finish the task.
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