It's the canister close valve, also known generically as the vent valve.
You'll find it with the charcoal canister.
Although the definition of P0449 indicates a purely electrical condition,
Hyundai uses this code to mean the same thing as P0446, indicating an
unexpected vacuum on the evaporative emissions system. This could be
anything from a faulty fuel tank pressure sensor indicating vacuum to a
sticking close valve or other restriction preventing proper air intake to
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