How do you fix a P0440 P0441 code on a 2003 dodge neon?

To fix a P0440 or P0441 code on a 2003 Dodge Neon, start by inspecting the fuel vapor system for any leaks, particularly in the EVAP hoses, canister, and gas cap. Ensure the gas cap is properly tightened or replace it if it's damaged. Next, check the EVAP purge valve and vent valve for proper function; they may need cleaning or replacement. If issues persist, use a scan tool to reset the codes and monitor the system for any reoccurrences.