that's what I was about to point at. I think you either have:
an exhaust leak after the light off cats (front) and it's freaking your 02s out.
A bad/damaged cat.
A short in the wires that feed the O2 signals to the ECU.
It's all pretty easy to check. You'll need a volt meter to check the wiring and that'd probably be my last step since it a minor PITA to properly complete that test. I'm betting you've got a busticated cat. Buy yourself a catted X or H pipe and slap that bad boy on. It's time for an upgrade anyway. Catted pipes will also sometimes throw codes but at least they're cat efficiency codes and you'll know to ignore them. They also take a while to throw that specific code so it's not usually a frequent issue.
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