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My frontier keeps showing a large evap leak code but the Nissan dealership tests the system and finds no leak. I tried changing the gas cap and am very diligent about closing it properly.
What can be causing this problem ?
How can I get a code but no leak can be found ?
Very frustrated, appreciate any help.
Vehicle: 2004 Nissan Frontier

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When this type of condition exist, the first step is to check the charcoal canister for internal obstruction that will interference with the evaporative system performnace

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