Where is the oxygen sensor located?

2006 CHEVROLET UPLANDER
110,000 MILES
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Where is the oxygen sensor located and if it is behind the catalytic converter where is that
Dec 27, 2012 at 10:37 PM
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JDL
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In the exhaust, before and after the cat. Check out the images (below). Please let us know what happens.
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Dec 27, 2012 at 10:47 PM
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JDL
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This picture may help?
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Dec 27, 2012 at 10:55 PM