2001 Toyota Camry Q&A

2001 Toyota Camry Question: failed emission because of P0442. A small leak was detected.

I was told to repair or replace the canister/purge valve. If I were told to replace those parts, should I pay for a general diagnostic then have the part repaired? how much does a repair or replace costs? The light came one once before and I replaced the gas cap. It did not go off but was told by the person at Auto Zone that the gas cap was the problem. -
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