The car engine P1123 Code is found from the car engine and it is available in many car engines. The meaning of the car engine code is found from the manual of the car engine. By the name of the car and car manufacturer, you can find the real meaning of the code. If the real meaning of the code is not found, you cannot solve the car engine properly. Finding the cause of the car engine problem is very important and if you do not know how to find the car engine problem, you can give the car to an automobile engineer.