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It is located underneath above the exhaust closest to the driver side if you didnt know. The cheapest way to do it is using a 22mm wrench and just cut the wires to the plug or you can buy the oxygen sensor removal tool at your local auto parts store and just simply turn till it comes off. You may need to pick up a can of pb blaster or ws 40 or some kind of lubricant to help remove it because it may have rusted over the years and should be cleaned out to prevent future rust. Then simply install the new one.
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