P2096 will only clear when the adaptations are cleared. If the issue has been remedied, it will not return. You can clear this one with a handheld, but it will return even if the issue is resolved. The adaptations must be cleared/reset. Typically the 'issue' is that extra air is entering the intake or exhaust.
P2270 could be just a bad O2, or could be related to the above code, this one will clear itself after the issue is remedied, after a few restarts, or you can clear with a handheld.
