On single car engine problem may trigger more serious problem and those problems can be difficult or expensive to solve. The car engine P2291 Code is found when the car engine is checked. Multiple causes may be the reason of this car engine problem. From the car engine code, you will learn some information about the car engine problem and take step for solving the car engine. Do not use wrong meaning of the code to understand the car engine problem. The right meaning of the code can give you the right information of the car engine problem. However, check the car engine by an automobile engineer.