how can i tell that my o2's are bad? i have hpt and a wb. are they supposed to constantly switch up and down a few time a sec? on decel, i get a rich afr and the o2's hang up flat at 800+ mv.
car has 80k and i'm having too many problems with my tune for 36lb injectors and am suspecting the o2's because i don't know what is wrong with the tune...not that i know what is right with the tune either. no codes are coming up.

 

this is na doesn't look too bad here but still rich.

 

this is with nitrous. it's lean on n2o at 13's and very rich when i let off the gas. the o2's in both pics are up at 800+ during decel. so are the 02's bad?

 

i did some logging and it is in fuel trim 21 that's rich decel before dfco. hptuners help file shows cells 0-15 only.

and for some reason according to the hptuners help file display of the fuel trim cells did not correlate with my actual map vs. rpm. i was on the freeway cruising at 2000 rpm's and 49 map which should be cell 5(from what i can tell) but my log was showing that i was in cell 4(400-1200 rpm cell but correct map area). could my transmission be causing this. or any sensors?