What does it mean when the old Volkswagen Santana won't start and shows a key symbol?

[StLuke]

This is the anti-theft light, indicating that the vehicle is currently not detecting a valid key, so the car is in anti-theft mode. More information about the old Volkswagen Santana not starting is as follows: 1. Solutions: If you are sure it's the original car key, then the key is likely broken, and you need to re-match the anti-theft system. It is recommended to consult a local professional car key specialist. The car dashboard is a device that reflects the working conditions of various vehicle systems. Common indicators include the fuel light, washer fluid light, electronic throttle light, front and rear fog light indicators, and warning lights. 2. Other: When the indicator light comes on, immediately check the odometer. If the accumulated mileage reaches or exceeds 100,000 kilometers, the timing belt must be replaced. Otherwise, the timing belt may break, causing the engine to malfunction. After installing a new timing belt, remove the rubber plug covering the odometer reset switch and press the internal reset switch with a small rod to turn off the timing belt indicator light. If the light does not turn off after operating the reset switch, the reset switch may be faulty, or the wiring may be hooked up incorrectly, so the issue should be repaired and resolved.