Method for modifying an on-board diagnosis of a vehicle that has a control unit, - wherein the control unit checks whether a specific trigger condition has been reached and, when a specific trigger condition occurs, performs an on-board diagnosis for components of the vehicle, wherein - the vehicle transmits data concerning the on-board diagnosis to a server, - these transmitted data are compared in the server with data concerning on-board diagnoses that have been transmitted by comparison vehicles (100a, 100b, 100c), and - this comparison is taken as a basis for making (206, 206b) a modification to the on-board diagnosis of the vehicle, characterized - in that the vehicle transmits data concerning a driving style of a driver of the vehicle to the server, - in that a frequency with which the on-board diagnosis is performed by the control unit is determined in the course of the comparison in the server, - in that a quality of the on-board diagnosis of the vehicle is determined in the course of the comparison in the server as a function of the determined frequency and the driving style, - in that a check is performed in the course of the comparison in the server to ascertain whether the determined quality of the on-board diagnosis of the motor vehicle meets a specific requirement, the requirement determining a minimum value for the frequency on the basis of the driving style, - in that if the quality of the on-board diagnosis does not meet the specific requirement in the course of the comparison, the trigger condition for the on-board diagnosis is altered by the server using the data of the comparison vehicles, with a trigger condition of a comparison vehicle whose driver has a similar driving style to the driver of the motor vehicle, but whose on-board diagnosis meets the requirement, being adopted, - in that the server transmits this altered trigger condition to the control unit, and the previous condition is replaced there. - wherein the control unit checks whether a specific trigger condition has been reached and, when a specific trigger condition occurs, performs an on-board diagnosis for components of the vehicle, - the vehicle transmits data concerning the on-board diagnosis to a server, - these transmitted data are compared in the server with data concerning on-board diagnoses that have been transmitted by comparison vehicles (100a, 100b, 100c), and - this comparison is taken as a basis for making (206, 206b) a modification to the on-board diagnosis of the vehicle, characterized - in that the vehicle transmits data concerning a driving style of a driver of the vehicle to the server, - in that a frequency with which the on-board diagnosis is performed by the control unit is determined in the course of the comparison in the server, - in that a quality of the on-board diagnosis of the vehicle is determined in the course of the comparison in the server as a function of the determined frequency and the driving style, - in that a check is performed in the course of the comparison in the server to ascertain whether the determined quality of the on-board diagnosis of the motor vehicle meets a specific requirement, the requirement determining a minimum value for the frequency on the basis of the driving style, - in that if the quality of the on-board diagnosis does not meet the specific requirement in the course of the comparison, the trigger condition for the on-board diagnosis is altered by the server using the data of the comparison vehicles, with a trigger condition of a comparison vehicle whose driver has a similar driving style to the driver of the motor vehicle, but whose on-board diagnosis meets the requirement, being adopted, - in that the server transmits this altered trigger condition to the control unit, and the previous condition is replaced there.