Every transponder key contains a tiny microchip embedded in the head of the key. When you insert the key into the ignition and turn it, the chip sends a unique coded signal to your vehicle's immobilizer system. The immobilizer checks whether the signal matches what it expects. If it does, the engine starts. If it doesn't, the engine stays locked - even if the key blade is cut perfectly.

This system was designed to prevent car theft. A standard metal key copy can turn the ignition, but without the right chip sending the right code, the car won't start. It's an effective security feature, but it also means that replacing or duplicating a transponder key requires more than just cutting a blade. The chip has to be programmed to match your specific vehicle.

Transponder keys became standard on most vehicles starting in the mid-1990s. If your car was built after that, there's a good chance it uses some version of this system.

Transponder keys can't be duplicated at a hardware store. The blade can be cut, but the chip won't be programmed - which means the key won't start the car.

Replacing or duplicating a transponder key requires two things: precision cutting of the key blade and programming of the chip to communicate with your vehicle's immobilizer. Both steps need to be done with professional equipment.

Knox Car Keys handles both on-site. We come to your location with the cutting equipment and diagnostic tools to cut the blade, program the chip, sync it with your vehicle, and test it before we leave. No tow, no dealer appointment, no waiting.

FOBIK stands for Frequency Operated Button Integrated Key. It's a combination device that handles two jobs at once: it acts as your keyless entry remote (lock, unlock, trunk, panic) and as your ignition key.

Instead of inserting a metal blade into a traditional ignition cylinder, you slide the fobik into a slot on the dashboard or steering column. The vehicle reads the fobik's electronic signal, verifies it's authorized, and allows the engine to start when you press the brake pedal.

Fobik keys are most commonly found on Chrysler, Dodge, and Jeep vehicles, though the specific design varies by model and year. They became widely used starting in the mid-2000s as manufacturers moved away from traditional key-and-cylinder ignition systems.

Most fobik keys also contain a small hidden emergency key - a thin metal blade tucked inside the fob casing. This emergency key can manually unlock the driver's door if the fobik's battery dies, but it won't start the vehicle.

Transponder keys can't be duplicated at a hardware store. The blade can be cut, but the chip won't be programmed - which means the key won't start the car.

Replacing or duplicating a transponder key requires two things: precision cutting of the key blade and programming of the chip to communicate with your vehicle's immobilizer. Both steps need to be done with professional equipment.

Knox Car Keys handles both on-site. We come to your location with the cutting equipment and diagnostic tools to cut the blade, program the chip, sync it with your vehicle, and test it before we leave. No tow, no dealer appointment, no waiting.