Why is the fault light of Magic Speed s3 engine always on?

It shows that there is a fault in the engine electronic control system, which is generally caused by the damage of an electronic component (sensor). It is necessary to use a computer to detect fault codes and maintain faults. It may also be an error fault code, just clear it. Go to the repair shop, no matter who needs professional instrument testing. If it is open frequently, you should check it. My car was driving for a while, but it didn't work when it disappeared.