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Discussion Starter · #1 ·
My xb is around 288k i've changed the cat probably around the 240k mark. now my question in relation to the code is. would it be the upstream sensor or the down stream? i've bench tested the resistance of them both the upstream one is reading around 4 ohms while the rear is reading around 13/14. I wanted to know if this was normal or that i should replace the downstream one? thanks!
 
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