Do not use wrong meaning of the car engine U1091 Code for fixing the car engine problem. The automobile meaning of the code is not helpful and you can easily know the right meaning from the car manufacturer. The car manufacturer set a right meaning of the code and it is related with the model of the car. However, you should scan the car engine problem related symptoms and find the exact cause of the car engine problem. It will be easy for you to fix the car engine problem easily. You have nothing to worry, you should take car for a test drive.