Kia Rio P0447 code issue with smoking from emissions system after extended driving on Kia Rio

Some Kia Rio owners report experiencing issues related to the diagnostic trouble code (DTC) P0447, which indicates a problem with the EVAP (Evaporative Emission) system's Vent Control Valve Circuit. This issue can compromise the vehicle's ability to capture and store fuel vapors, leading to increased harmful emissions. Additionally, some owners notice smoke emitting from the engine after extended driving, which may signal serious problems such as overheating, burning oil, or even a melting wiring harness. Blue smoke from the exhaust is another concern reported by Kia Rio owners, often linked to bad valve seals, valve train wear, or burning transmission fluid, indicating the engine is burning oil. To address the P0447 code, a visual inspection of the wiring harness and connectors is recommended to identify any damage. Systematic diagnostics, including connecting an OBD-II scanner, are crucial to pinpoint the issue and ensure the EVAP system functions properly, as problems can also trigger the check engine light.