VCDS, a powerful diagnostic tool for Volkswagen, Audi, Seat, and Skoda vehicles, allows access to various control modules. This access raises the question: can VCDS correct mileage? The answer is a complex one with significant legal and ethical implications.
While technically possible to alter the odometer reading in the instrument cluster using VCDS, doing so for fraudulent purposes is illegal in most jurisdictions. The instrument cluster stores the vehicle’s mileage and transmits this information to other modules in the car. Changing this value in the cluster will subsequently update the mileage displayed in other modules.
However, even with a mileage correction in the instrument cluster, traces of the original mileage might remain in other modules’ fault codes and freeze-frame data. This data captures the mileage at the time a fault occurred. If a fault was logged before a mileage adjustment, a scan with VCDS could reveal a discrepancy between the current odometer reading and the mileage recorded in the fault logs.
A skilled technician using VCDS can potentially clear fault codes in individual modules. This process could erase the historical mileage data stored within those modules. However, not all modules store mileage data, and the thoroughness of clearing these codes varies. Therefore, detecting mileage manipulation is not always guaranteed, even with a comprehensive VCDS scan.
When purchasing a used vehicle, consider using VCDS to scan for discrepancies in mileage readings across different modules. For instance, a mismatched mileage between the instrument cluster and a module like the engine control unit could indicate potential tampering. While a difference could be due to a legitimate module replacement, further investigation is warranted. Always question any inconsistencies and consider seeking professional advice if suspicious.
