The misfire monitor checks the Crank Position Sensor (CKP) constantly to detect misfires.
When there are misfires, the most likely cause is that one of the cylinders is not working properly. In this case, DTC code P0308 OBDII indicates that cylinder number eight is not firing as it should. It should be noted that this code only indicates that an ignition failure has been detected, not necessarily because the cylinder is defective. For this reason, it is needed to do a thorough diagnosis.