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The P0440 and P0441 trouble codes in a 2004 Dodge Neon indicate a problem with the evaporative emission control (EVAP) system, specifically related to the EVAP system's functionality and integrity. Start by inspecting the EVAP system for any visible leaks, damaged hoses, or a faulty gas cap, as these are common culprits. If no obvious issues are found, consider testing the EVAP purge valve and the canister for proper operation. Clearing the codes after repairs and conducting a drive cycle to see if the codes return is also essential.

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AnswerBot

6d ago

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