Why does the car turn on the key light and won't start?

If the key light on the instrument does not go out, it means that the electronic anti-theft system has not been disarmed. Do not try to start the vehicle at this time. Common causes of electronic anti-theft system failure are: 1, key chip damage, and anti-theft system failure answer. 2. The key information receiving antenna is damaged, so it is impossible to exchange anti-theft information with the key. 3. The engine computer is out of order. 4. The intelligent control box is out of order. The specific reasons need to be detected by the service station to draw a conclusion.