Hey my check engine light wont go off.... The obd2 is reading Catylist effiency and when i look these codes up it is either the cat or o2 sensors and replaced all of the above! Has any one else had this problem? I have reset it a couple times and it always pops back on eventually.

 

Which O2 sensors did you replace, upstream, downstream, both, which bank? What brand sensors did you use? What # code? AIR pump working OK?

 

both sensors bank 1 and 2 and the one before the cat... bosch was the brand, but idk about the air pump... I havent even thought that that could be the problem