This engine U1242 Code is set in all the car engines and this code becomes visible when the car engine code cannot verify the car engine. If the meaning of this code is not found, it is not possible to know about the problem and fix the car engine. Do not use engine code meaning from different car manufacturer. You need to use the car engine meaning from your car manufacturer. If you do not get the right meaning of the code, do not follow the wrong meaning or automobile meaning of the car engine. You should be careful and you need to take the car for a test drive if the car engine is ok.