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If your car key has a plastic head, it almost certainly hides a transponder chip. That tiny chip is why a copied metal key alone won’t start a modern car — here’s how it works.
What a transponder key does
When you turn the key or press start, the car sends a signal to the chip, which replies with a unique code. Only if the code matches will the immobiliser let the engine start — a powerful anti-theft feature standard on cars for the last two decades.
- The chip has no battery — it’s powered by the car’s signal
- Each chip carries a unique, matched code
- No valid code means no start, even with a cut key
Transponder vs remote vs smart key
These terms overlap but aren’t the same thing.
- Transponder key — chip in the key head, turned in the ignition
- Remote key — adds buttons to lock/unlock from a distance
- Smart key — keyless entry and push-button start
Getting one cut and programmed
A new transponder key must be both cut to your lock and programmed to your car’s immobiliser. A mobile auto locksmith can do both on site for most makes — usually faster and cheaper than the dealership — and disable a lost key so it can no longer start your car.
