Diagnostic method and diagnostic apparatus for a vehicle component of a vehicle

The invention relates to a diagnostic method for a vehicle component of a vehicle, during operation of the vehicle, an operating parameter of the vehicle component is detected (101), and wherein depending on the detected operating parameters of a status message according to a status of the vehicle component to a vehicle-external server (303, 405) for Sending an evaluation of the status message (103) is sent with a rating based on an evaluation of the status message to a receiving device (305) (105). The invention further relates to a corresponding diagnostic device (201, 501), a corresponding diagnostic system (301, 401) and a computer program.