i rencently ataped car and found out my rear o2's may be bad even though i am not getting a code..
bank 1 sensor 2
bank 2 sensor 2
are not moving or reading like the other two which iwas told that thier suppose to be moving up and down on the graph.. i ask becuase im trying to get to the bottom of my gas mpg problem i've been having..

any help is appreciaited.. i can also send the files from atap..

thanks christian

 

You still have the stock exhaust & cats? The rear O2's should be slower and less reactive than the front 2 . This is normal for operating catalytic converters.

 

i have flowmasters and have the stock cats.what else can it be.. they are actully above 700mv on atap the whole time i was scanning them.

thanks anywayz

 

i dont understand why they would be bad if yo have stock headders and cats. maybe if you know someone that had sims, see if they will let you borrow them for a test drive and see if that help. that should solve your question about your rear 02's. also when's the last time you changed your fuel filter? you should change it every 10-15k miles. if not that, maybe clean/change you air filter? just a few easy tips. hope it helps some.