P2270 error

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Buick Ownership
I'm getting a P2270 error (O2 sensor signal stuck lean on bank 1 sensor 2 to the control module ) on my 2011 Regal 2.4.
If I clear it, it will stay off for days, but then pop up again out of no where. The car still runs fine.
Funny thing is, twice now I've stopped for gas and as soon as I do, the light goes off. Could the tank not be getting vented?
Is it vented through the cap, or through the emission system?
Is there any other reason that removing the gas cap would fix the issue?
Thanks for your input.
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