Check engine light went off, car a bit sluggish and diagnostic test codes below. on 2009 Chevrolet Malibu

The light went off (1,500 miles ago) after getting gas so I figured I needed a cap and they ran a test and said it wasn't my cap. The codes that came up were U2105, U2106, U2107, P0449 and P0455.....113,000 miles on car, mostly highway miles.

Asked by for the 2009 Chevrolet Malibu