You should fix the car engine by an automobile engineer and you must take the car to automobile repair center for solving the car engine problem. By the car engine coder, the engine P1236 Code is found and the engine code lets you know the reason of the problem. It is also important to know the right meaning of the code. The right meaning of the code is related with the car manufacturer. You need to get that right meaning for solving the car engine problem. If you do not know the right meaning of the code, it is impossible to fix the car engine quick.