A P1456 code is a small evaporative emissions leak that has been detected in the fuel tank side of the system. The first thing I often check is to see if the fuel cap is tight, usually 3 clicks should do it. If it is tight, then I inspect the seal on the cap. If it’s dry rotted like this one, I replace it and reset the code. It usually solves the problem. I recommend OE fuel caps whenever possible.
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