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Does anyone know the right part number for the O2 sensor that is on the passenger side before the cats? I found two differnt ones online....a "heated" one and an "upstream" one. Thanks!!!!
 

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Bosch lists the OE type part number as 13127. All four of ours should be the same. Upstream is the location closest to the engine, down stream is further away (our 4.6L cars have 4 oxygen sensors; all are 'heated').
 
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