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P0456 = Evaporative Emissions System - Small leak detected. There could be a small leak the size of a pin hole somewhere in the EVAP system. Finding this leak on your own can be difficult and almost impossible without the use of a smoke machine.
A good place to start would be to spray a little carb cleaner on a shop rag and wipe down the fuel filler neck seal area with a clean lint free shop rag and replace the gas cap with a new one. If that doesn't do the trick, eye ball the EVAP system carefully front to back looking for trouble spots. If that doesn't help you will need to have a garage do a smoke test on the EVAP system. There are some videos on You Tube where people have built there own home made smoke machines to test automotive EVAP systems. You will need to understand how the EVAP system works to properly test it for leaks with a smoke machine. Good luck.

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