The trouble P1120 Code helps to solve the car engine by the right meaning of the code. This code comes on the car engine code reader screen when the car engine was checked. The real meaning of the code is provided by the car manufacturer and use that meaning if you know the meaning of the code. By the real meaning of code, you can fix the car engine if you are an expert automobile engineer and you have tools for solving the car. A single problem in the powertrain is not difficult to solve and it can be fixed without changing any part from the car engine.