Usually this is a loose or improperly sealing gas cap. The code will clear out (iirc requires 3 starts from cold) or get your local autoparts store to clear it for you. Gas cap is easiest and cheapest thing to try. It can also be a leaky evaporation canister, leaky vacuum hose, leaky fuel filler hose...etc. basically as part of the test cycle it checks to see if the evaporation system holds a specific vacuum for a specific time. Yours failed the test.
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