What Is a Transponder Key?
A transponder key contains a small electronic chip inside the key head that communicates with your vehicle's immobiliser. When you insert the key, the car's ECU sends a radio signal to the chip — if it responds with the correct code, the immobiliser disables and the engine can start. If the code doesn't match, the car won't start even if the blade fits.
Most vehicles made after the mid-1990s use some form of transponder technology. Many newer vehicles have moved to proximity (smart key) systems, which work differently — but we handle both.
What Is a Proximity Key (Smart Key)?
A proximity key — also called a smart key or keyless entry fob — doesn't need to be inserted into the ignition. Your vehicle detects it wirelessly when it's within range, allowing you to unlock the doors and start the engine with a button press while the key stays in your pocket or bag.
Proximity keys are increasingly common on vehicles from 2010 onwards, particularly in the mid-range and luxury segments. They contain more complex electronics than a standard transponder key and must be programmed using specialist equipment. If your proximity key is lost, damaged, or unresponsive, we can supply and program a replacement on-site.
Why Key Programming Requires Specialist Equipment
Cutting the blade is only half the job. Both transponder and proximity keys must be coded to match your specific vehicle's immobiliser. Without the right equipment, the key physically fits but the car won't start. That's why hardware store key cutting can't help with modern cars.
Titan uses AASRA-accredited tools alongside modern aftermarket key coding equipment — which means we can program transponder and proximity keys correctly, first time, for most makes and models. We're not limited to a single software platform, which is why we can cover a wider range of vehicles than most locksmiths.
Common Issues We Fix
- Key turns but car won't start (immobiliser fault or lost sync)
- Transponder or proximity key lost — full replacement and programming
- Proximity key battery dead or fob unresponsive
- New key supplied but not yet programmed to your vehicle
- Chip damage inside the key head
- Push-button start not responding to proximity key
- Remote locking not working but blade/engine still works
Makes We Cover
We program transponder and proximity keys for most major makes including Toyota, Mazda, Honda, Nissan, Hyundai, Kia, Ford, Holden, Subaru, Mitsubishi, Lexus, Land Rover, and many more. Call to confirm your specific vehicle.