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If the 02 sensors are so tight ,the only way to remove them is by heating the bottom most part of the sensor gently and working back and forth. It may be easier to cut the sensor wires and get a good socket wrench on it. Don't worry if the thread strips as you can re-thread the insert. I take it the sensor is unservicable and that is the reason for replacement.

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Q: What to do when oxygen sensors are too tight?
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