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You will most likely need a special tool for removing oxygen sensors (auto stores carry them as well as the sensors). Then I soak them for several days to a week with a good penetrating oil (like PB Blaster), then use jack stands to safely get under Jeep and start it up for only a couple minutes or less to heat the exhaust pipe to expand it (only want it warm not hot!). The while it is warm remove the sensor. Make sure the replacement has anti-sieze compound on the threads & install replacement.

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Q: How do you replace oxygen sensor in a 94 jeep wrangler?
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