You need to solve the problem of the car engine and in this case, the engine P0686 Code helps to solve the problem. Do not drive the car with the engine problem. As problem of the engine is located in the car engine, you can fix the car engine easily and you may not need to change any part from the car engine. The engine code will not visible again when the engine is fixed properly. The engine code contains necessary information and by the right meaning of the code, you will get the right information. Do allow any meaning of the code except the automobile manufacturer’s meaning.