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2011 Subaru Impreza WRX Question: Whats up with my upstream o2 sensor (I think bank 1) its throwing the P0135 code

 

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bobbywc, 2.5L 4 Cylinder Turbo, Bowling Green, KY, June 30, 2013, 23:19
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I haven't changed my o2 sensor yet, but I have got the code reset twice just to double check what code was showing but every once in a while my check engine light will go off by itself and I was just curious to see why it would be going off by itself, it usually comes back on either shortly after the CEL goes off or when I start my car again.

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