Collect the meaning of the engine P0103 Code from a reliable source. You will get information from online easily. The engine code P0103 is the code for a trouble with the Mass Airflow Sensor having a high voltage yield to the Engine Control Unit. There are some causes of the engine code and those are The cause of the trouble is the sensor voltage output is advanced than usual or obligatory by the ECU to function with other sensor signals. The cabling or MAF sensor may be too near to advanced voltage consumption parts, alternators, explosion chains, etc. causing mistaken output signals.