SPN and FMI are the display forms of fault codes specified by SAE. In the past, all vehicles needed a practical decoder to read the fault code, but now some models have the function of their own decoder.

The function of reading and querying fault codes (taking Ou Man GTL Super Edition as an example);

1. When the engine fault prompt appears on the screen, press the down () key on the left side of the steering wheel.

2. After the instrument screen changes to the line menu, press Enter to enter.

3. Press the key to select DM 1_EDC, and press Enter again to view SPN &；; FMI is displayed.

Extended data:

Generally speaking, cars equipped with microprocessor control units have fault self-diagnosis systems. It can be used to automatically check and monitor the working conditions of various parts of the internal transmission system and control system of the automobile. When the car breaks down, the failure indicator light installed on the dashboard will flash to warn the owner that there may be something wrong with the car. Press the button and the fault code will be displayed on the dashboard. At the same time, the fault signal will be stored in the memory. Even if the ignition switch is turned off, the fault is eliminated, and the fault indicator light is turned off, the fault signal will still remain in the memory for the maintenance personnel to judge the automobile fault.