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They are located on the exhaust, just after the exaust manifold goes into the down pipe. You have 4 total o2 (oxygen sensors) 2 for each side. They are before and after the first exhaust cataylst. You should be able to see the upper ones from the top, and the lower ones from the bottom. 22mm wrench for the lower ones works, and a special o2 socket works really good for the 2 upper ones.
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