The engine U1172 Code is not exceptional thing and you must not get any solution for solving the car engine problem if the right meaning of the code is discovered. Do not allow any meaning of the code for solving the car engine problem. The automobile engineer must find the correct meaning of the code and for this reason, he needs to know the real meaning of the car engine. With the car engine problem, do not drive. You must look for the right meaning what is found in the car engine manual. The automobile meaning of the code is found online.