I HAVE AN 2004 CHEVY IMPALA WHICH HAS FORMULA PO455 AS WELL AS WE ALTERED A GAS CAP, WHAT NOW?

I have an 2004 Chevy Impala that has code PO455 and I changed the gas cap, what now? I have until the 31st to figure this out or I can't get tags! Help, please! Best answer for I have an 2004 Chevy Impala that has code PO455 and I changed the gas cap, what now? : Answer by 4114You have to reset the check engine light and drive it around a bit so the EVAP monitor can run its cycle. The EVAP won't run if there is more than 3/4 or less than 1/4 tank of gas. Usually it runs after a long "soak" Read More

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