If you face problem in the car engine, solve the car engine is very important for driving the car. You need to fix the car engine by the meaning of the code and you will use the right meaning of the code what is found from the car manufacturer. The engine P2004 Code is found from your car engine when the car engine was checked. The meaning of the code is available in the car engine manual. You can use automobile dictionary meaning if it necessary to use. However, if you have all necessary things and you do not know how to solve the car engine, get help from an automobile engineer.