The engine P0166 Code is a short explanation of the car engine problem and it is necessary to know the right meaning of the code. You will get that meaning of the code from the car manufacturer. You find the meaning of the code according to your car brand and model number. You should study well and have proper knowledge for solving the car engine problem. Do not hurry to fix the car engine problem. Some hand tools are also necessary to solve the car engine problem. Do not drive the car with any type of engine problem and you should be careful.