The car engine should be checked and the engine P0501 Code comes for the test of the car engine. The main problem of the car engine should be fixed as soon as possible. The engineer must allow only the right meaning of the code and do not allow any other meanings of the code what are found from the right source. The car manufacturer is the right source where you may get correct meaning of the code and use that correct meaning for solving the car engine. Wrong meaning of the code may make more problems in the car engine what are difficult to solve.