2013 Chevy Malibu code P2097 has come on; how do you fix it?

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The check engine light came on with my 2013 Chevrolet Malibu. I went to AutoZone and they said the code reader came back with P2097 -- a post catalyst fuel trim system too rich bank 1. My car is a 2013 Chevrolet Malibu with 45,000 miles. The car runs like its new even with the engine lights on. HOW do i fix this??