Definition of the engine code lets you know about the car engine problem and that is why, you need to know the real meaning of the engine P0100 Code. The symptoms of the car engine are P0100 code will be headed by the Check Engine Light coming on the console display. Simply, the car runs well adequate to give you time to contact a expert technician to help you to analyze the problem. The engine runs close to usual but it may run somewhat unreliably, have less power and lazy conflictingly. Driving the car is necessary for a test drive.