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P0442 Evaporative Emission Control System - Leak Detected (small leak)

Fuel System

Vehicle Information: Model (Boxster, Boxster S,Cayman, Cayman S): Boxster S; Year: 2001; Engine (type, size, modifications): 3.2L; Total Mileage: 11000; Transmission: Manual;

I get a check engine light everytime my fuel tank is around half-full or less. I stopped of at autozone and their OBDII tester revealed a P0442 error code. I have looked at the gas cap and it looks fine, and I believe I fasten the cap correctly. I even looked under the battery cage and have seen no issue with the connectors or smelt any fuel. When I fill the gas tank, I remove the battery leads to reset the error with success. I just have no idea why I am getting this problem.

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