The engine P0129 Code is important and it is set by the car manufacturer. For solving the car engine, the meaning of the car engine is necessary. It is necessary to use some expensive machine and automobile engineer should have expertise. This engine code has different meanings and for you, correct meaning of the code is your car manufacturer’s meaning what you may get from the car engine manual. You need to find the car engine manual according to the car manufacturer and model name. Due to the powertrain problem, the engine code has come up and without changing component, solving the car engine is possible.