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DIY fix on P0456 code for 2003 Chrysler Voyager?

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What should be done after checking the gas cap for code P0456 on a 2003 Chrysler Voyager, for a DIY repair? The check engine light comes on when the engine has been idling for 1 min or longer.

Vehicle: 2003, Plymouth, Voyager, 3.3L

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P0456 Small evap leak

Hopefully it is the gas cap, there is a TSB for erroneous evap leak TSB 18-028-03.
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It doesn't seem to be the gas cap.

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