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There should be 2 of them. Upstream and downstream. Upstream means before the catalytic converter(usally screwed into the exhaust maifold) and downstream after the catalytic converter(usally in the exhaust pipe) I have seen in some repair manuals it is located inside the computer,but I have never found one there. Look on your exhaust system first. And they are a REAL PAIN to get out. So dont be discouraged if you mess somthing up, or pay someone that has a heating tourch and knows lots of cuss words. Good Luck with this painfull project....

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15y ago
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Q: Where is location of 02 sensor for 1997 Chevrolet Cavalier?
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