You should be careful when you find any engine problem in the car and the engine U1100 Code is found online. You should be careful when choose right meaning of the engine code. The car engine problem is a serious problem and this problem can be fixed easily if you have expertise, hand tool and meaning of the code, you can easily solve the car engine problem. Do not follow automobile dictionary meaning for solving the car engine problem. The automobile dictionary meaning of the code is found online and you must not use any other meaning of the engine code for solving the car engine problem.