Hyundai Sonata engine light is on

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Nov 19, 2006
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#1
my brother as a 2002 Hyundai Sonata with 80,000 miles it as the 4 cylinder engine the check engine light came on he as a code P0466 when I looked it up I see it's a Emission purge flow sensor where would I find it and can it be tested also the gas cap is new that's the frist thing he replaced He also told me he is not filling it up with the engine running.
Thanks. Rob