Some of the OBDII codes take a few Ignition on/off cycles before the code is automatically cleared.. If the car seems to be running normal, you might have had an error or some anomaly that will clear itself after a few days..Have a 2018 hyundai kona that has been great until today engine light came on. Scanned it and have cylinder 1, 3 and 4 misfiring and a code for random misfire. 12,3xx miles. Any ideas?