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Can anyone tell me exactly where the O2sensors are located on a 2000 Suburban? I know that there are 4 I'm just not sure where they all are.

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one should be somewhere around the exhaust downpipe from the exhaust headers and there's probably another 2 behind the catalytic converters. I didn't even realize that the newer burbs have 4. AFAIK, my 91 only has one...
 
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