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Hope this is some help even though it is an uneducated guess, but easy enough to check.
I would look to the fuel pump relay...you can feel if it is getting hot, plus you can jump it out (its right next to your foot) and you could have a failing fuel pump as well. You can hear a failing fuel pump sometimes.
Check for leaks on the replaced AOS, I had the issue with mine after AOS service and that was what was wrong. (I didn't get any codes on this, however)
I would think the oxygen sensors would send a code if they were failing, not sure. also, the o2 codes only indicate something is out of whack, doesn't mean "bad sensor"
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