The engine P1517 Code is found in the car engine. The P1517 DTC explains more information and it explicitly mentions to the camshaft timing. In this case, if the cam timing is over retarded, the engine light will be illumined and the code P1517 will be set. This problem may started due to the leak in the fuel tank and associated hoses. That is why, it is important to test the car engine and it is possible by the expensive machines and you will get the expensive machines in the automobile repair center. An engineer will help you to fix the car engine.