Petrol generator shut-off switch. When connected it is off and when disconnected it is in working position. You can use a multimeter to measure whether the switch is turned on and off correctly. You can also try a new switch. If the main switch fails to extinguish the flame, it means that the switch cannot be turned on normally. You can also use a wire to directly short the switch to see if the motor can stop.
It is possible that the car's ignition switch is broken. The ignition switch has the ACC position, the ON position, and the START position. Turning on the ACC position is to connect the car's electrical equipment, such as audio, lights, etc. ON position is to connect ABS (anti-lock braking system), AIRBAG (airbag), oil pump and operating powerof the car's ECU. And START means to begin. If the car cannot stop turning on, the most likely reason is that the car's ignition switch is broken.
For detailed answers, it is recommended to go to the 4S store to see a maintenance technician.