P0420 maybe o2 sensor?

mercredi 15 juillet 2015

So i replaced my rear o2 sensor a while back and ever since then i had a p0420 code but the thing is i think i put a front o2 on the rear (it has a really long wire) i ordered it on rock auto some generic one there wasnt even one in the car before and all i got was a low voltage for rear 02 cel which is understandable so i dont know if its because the cats bad the rear o2 is potentially a front one (if even possible) its because its generic or my cats bad (unknown aftermarket cat) anyone have any ideas?


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