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I bought an O2 sensor socket that has a cutout for the wires, and an extension piece off to the side that has a 3/8" square drive. You slip it over the O2 sensor and use a 3/8" socket wrench to turn it. Since the extension piece is out to the side you can often get to it with an extension from the bottom side of the pipe. This is very useful when the top of the sensor does not have enough clearance around it to allow the socket handle to turn without hitting the body.
Bruce
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