The diagnosis engine U1120 Code helps to know about the car engine problem and it is important to understand the real meaning of the code. You need to know real information and real information will be found from the car manufacturer. Do not follow wrong meaning of the code for solving the car engine problem. Like the all car engines, this engine process services particularly advanced hydraulic lifters for the engine U1120 code intake and finish valves. The lifters can be distorted by disengaging an internal locking pin. The locking pin is disengaged using solenoids to alter oil heaviness fed into the lifter.