The engine P0105 OBD-II Trouble Code and it is Manifold Air Pressure Barometric Pressure Sensor Electrical Circuit Problem. The meaning of the engine code is the general code for a problem with the MAP tour having an electrical failure or malfunction. The MAP sensor is an essential part of the fuel injection system and offers signals to the Engine Control Unit for smooth process and good fuel economy. There are some cause of the engine code and it is necessary to diagnose the car engine to know the right reason of the car engine. Once the car engine is solved, test the car by driving.