On the 2002 Hyundai Accent the P1401 is actually a known problem, and Hyundai has issued a Technical Service Bulletin that states the common cause for this issue is “Water leakage into the DM-TL (Diagnosis Module-Tank Leakage) may result in corrosion of the DMTL connector pins. To correct this condition, replace the DM-TL and DM-TL wiring connector.”. It’s located under the vehicle, on the rear, driver’s side.
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