Do not use wrong meaning of the engine U1121 Code for solving the car engine problem. You will get various meanings of the code but you must use right meaning of the engine code. That is why, you should read the car engine manual where you will you get all information. The car engine manual contains necessary data including the car engine information and brand name. Once you know the real meaning of the code, you have nothing to worry about it, you can go to the next step for fixing the car engine. You should study well the car engine and car manual to get all information.