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If you are installing a new one I would unplug the wire harness to the bad sensor and then cut the wires off at the sensor. This allows you to slip a 7/8" box wrench over the sensor to break it loose and remove it. Install the new one and tighten it with a 7/8" open end wrench and plug the harness back in. Tighten it as you would a spark plug.

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Q: How do you replace an O2 sensor on a 1995 Chevy S-10 4.3 liter CPI Vortec engine?
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