The C1766 Code is necessary to know and for solving the car engine, an automobile meaning of the code is necessary. Do not drive the car until the car engine is ok. You can know the right meaning of the engine code from the manufacturer of your car. The alphabet C means chassis of the engine and getting the right meaning helps to solve the car engine. The automobile meaning does not help for solving the car engine. You must not try different meanings for the car engine for solving the engine. You should get right meaning always and finally, check the car as a test drive.