How do you fix ODB code PO441 on Lexus GS 400?

The ODB code PO441 on a Lexus GS 400 indicates an issue with the evaporative emission control system (EVAP), specifically related to the purge control valve. To fix it, first inspect the vacuum lines and connections for leaks or damage. Next, check the purge valve for proper operation and replace it if faulty. Additionally, ensure the gas cap is secure and in good condition, as a loose or damaged cap can also trigger this code.