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I have a 2000 ES350 with check engine codes P1130 and P1135.  I just looked up the part from Napa and it shows part number, Denso DEN 2349021.  It looks like this same sensor is used in two different areas, Upstream Rear;Bank 1 Sensor 1; Upstream Front;Bank 2 Sensor 1.  I replaced this same part last year for the Upstream Front; Bank 2, Sensor 1 and was hoping somebody can confirm that this same part is used in both locations.  Thank you very much!  

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they may be the same sensor, but they have different wiring and different part numbers.   look them up at rock auto parts. IF you replaced one sensor last year, replace the other now.

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