Coded key

A key containing a transponder chip which allows an immobilised vehicle to start.

A coded key in auto locksmithing refers to a key that has been programmed with a specific code that matches the vehicle’s ignition or locking system. This code is typically embedded in a transponder chip inside the key, which communicates with the vehicle's immobilizer system. The coded key ensures that only a key with the correct code can start the vehicle, providing a layer of security to prevent theft.

When you insert a coded key into the ignition or use it for keyless entry, the transponder chip sends a signal to the car’s security system. If the code matches what’s stored in the vehicle's computer, the car will start or allow entry. If the code doesn’t match, the vehicle won’t start, even if the physical key fits in the lock.

Coded keys are common in modern vehicles and are essential for systems like immobilizers, which prevent unauthorized access. Locksmiths need specialized tools to cut and program coded keys, ensuring that they match the vehicle's system.