Due to the powertrain problem of the car engine, the engine P0123 Code has screened on the engine code reader. Do not try to fix the car engine if you are unable to solve the car engine. Do not drive the car until the car engine problem is solved. The automobile meaning of the engine code is not useful for solving the car engine problem. It is better if you take the car to professionals. An automobile engineer has all necessary tools, machine and expertise for fixing the car engine problem. Powertrain problem is not difficult to solve for the experts.