What is engine code p440

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This code is for an evap system large leak. Could be cause by something as simple as a gas cap or by a bit more complex stuck open vent solenoid. Make sure your gas cap o-ring isnt cracked(dry rotted) if it is replace it also make sure it is on tight. Here is some more info I found on the web. http://repairpal.com/OBD-II-Code-P0440
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