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The cap can go bad and only a replacement works then. It has several ways of sealing inside. Sometimes simply pulling it off and retightening can fix it; past that you change cap. There can be a leak elsewhere to make the same code, the system simply assumes it is the cap but might not be.
 

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If it doesn't reset on its' own and has to wait on the next evap system check 5 days may be optimistic. I've seen evap resets take at least a week before.
 
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