The engine P0301 Code is a helping code what is used for solving the car engine quick. Do not use wrong meaning of the code solving the car engine problem. The problem of the car engine is not very difficult. The problem is related with the powertrain and problem in the powertrain problem can be fixed easily. The engine codes are found in many car engines and meanings are not similar. You should trust the real meaning of the code what is provided from the car manufacturer. Once the car engine is fixed, you must rely on the test drive to understand the car engine is ok or not.