Method for Monitoring a Subsystem Installed in a Motor Vehicle

A method for monitoring a subsystem installed in a motor vehicle, the method comprising:

• checking, by a diagnostic unit, the subsystem for system errors at least during driving cycles of the motor vehicle, wherein the check is performed for an occurrence of a system error and a correction of a system error;
• performing, by the diagnostic unit, a misuse assessment based on a frequency of detection of the occurrence or the correction of the system error in order to determine whether the detected occurrence or the detected correction of the system error is based on misuse,
• activating a restricted driving mode or continuing an activated restricted driving mode if occurrence of the system error is detected, wherein in the restricted driving mode drivability of the vehicle is restricted after
• a predefined number of driving cycles has elapsed without the correction of the system error being detected, or
• a predefined travel distance has passed without the correction of the system error being detected.