Will Ford Taurus start theft system is on?

If the "theft system" indicator is on in a Ford Taurus, it typically means that the vehicle's anti-theft system has been activated, preventing the engine from starting. This can occur if the key is not recognized or if there’s an issue with the system itself. To resolve the issue, try using a different key, ensuring the key is programmed correctly, or checking the battery in the key fob. If the problem persists, it may require professional assistance to diagnose and fix the vehicle's security system.