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Q:which sensor goes in right before the catalic converter?
A:The oxygen sensor located before the catalytic converter is upstream and the oxygen sensor located after the catalytic converter is downstream. For further assistance regarding the NTK Oxygen Sensor (Part No. 21004), please provide the year, make, model and engine size of your vehicle. For more information, please feel free to call us at 1-877-238-2623 or visit your nearest Advance Auto Parts store and one of our representatives would be more than happy to assist you.