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Once you find them there could be 3-4 usually 2 are under the passenger side 1 before the cat converter and 1 after them there should 1-2 more somewhere in the exhuast pipe that comes from the manifold on the drivers side.. As far as resetting them you can try unhooking the battery or buy yourself one of those mini code readers at a parts store....

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Q: How do you replace or reset the heated oxygen sensor in 2002 Chevy blazer?
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