The engine P2A03 Code comes for the engine code reader. When your car engine makes trouble and you take the car for test, then the code engine may come. Because the code engine has failed to test the engine area P2A03 Code. The automobile needs to get the real meaning of the code and that is why, they need to use manual of the car. In the manual of the car engine, the manufacturer name and model number are found. According the manufacturer and model, it is easy to identify the problem or meaning of the code easily. In this case, general meaning is not necessary.