Why is the car locked and unable to start?

[McSavannah]

When a car is locked and unable to start, it indicates the vehicle is equipped with an engine electronic anti-theft system, also known as a transponder-based immobilizer. Its fundamental principle is to lock the car's engine, electrical circuits, and fuel system, preventing the vehicle from starting without a chipped key. A locked car anti-theft system is a common malfunction of vehicle anti-theft devices. Relevant explanations are as follows: 1. The car has an engine electronic anti-theft system, which only allows the vehicle to start when the chip inside the key matches the code in the anti-theft system. 2. The spare key does not contain a chip, hence it cannot start the car. The spare key can only be used to unlock the door when the original key is lost.