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Upstream would be before the catalytic converter. Downstream would be after the catalytic converter.

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Q: How do you tell if an oxygen sensor is upstream or downstream on a 2002 Chevy silverado 1500?
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Is the upstream oxygen sensor the same as the downstream oxygen sensor?

no. the upstream sensor is the one before the catalytic converter and the downstream is the one after


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Which one? Upstream or downstream?


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Where is the oxygen sensor in a 2001 Hyundai Elantra?

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