If the check engine light illuminates in your Kia Picanto, it indicates a potential issue with the engine or emissions system. It is recommended to first check if the gas cap is properly tightened, as a loose or faulty gas cap can trigger the light. If the light persists, it is advisable to have the vehicle diagnosed by a qualified mechanic using an OBD-II scanner. The Kia Picanto automotive repair manual provides further guidance on interpreting specific error codes and potential solutions.