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I looked up this code on the gm service website and this code does not have anything to do with a o2 sensor. It is for the evaporative emissions system. If your gas cap was loose and its tight now disconnect your battery for 5 mins and reconnect it to erase the code. If the light comes back on then you will have to test the system which will require you to take it to a shop to have it tested, your best bet would be to take it into a dealership because they have the correct tester to do this and should take no more than an hour to check out. I work for a chevy dealer and have done this test myself and it is very easy to do. Good luck and let us know what it was.
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