The meaning of the C1266 Code is related with the car engine and you need to fix the car engine. Do not use automobile dictionary meaning for solving the car engine. You will get the general meaning of the code from the online but do not use the general meaning for solving the car engine. The real meaning of the code is available from the car manufacturer. That is why, you should ask the real meaning of the code from the car manufacturer. Do not make any new problem related with your car engine using common meaning of the engine code.