Method for improving diagnosis of a possible breakdown in a vehicle

Method for diagnosing a possible fault of a component (2.1) of a vehicle, including this procedure a first step of storing a first distance traveled by the vehicle, characterized in that said first distance is stored at the instant at which an event occurs linked to the fault, and the method also includes a second stage in which: - is stored at least one other distance, and then - the diagnosis is established from said stored distances.