What is a transponder key?

You may have heard about transponder key programming and transponder keys but are a bit unsure about what they are and what they can do. Here’s a quick guide to help you understand more about them:

  • Transponder keys are most commonly used to unlock and start vehicles and they do this by transmitting a radio signal from a handheld device to a remote receiver.
  • They were first introduced in 1995 to help with vehicle security.
  • Transponder keys are programmed so that can only start a specific vehicle in order to reduce theft.
  • Vehicles with transponders systems can potentially benefit from more favourable insurance premiums.
  • Transponder keys are available for a variety of different vehicles and are common in newer cars and prestigious models.
  • Transponder keys have a small microchip in the plastic part of the key which possesses a unique serial number matched to the vehicle. Unless the serial number matches the vehicle, it won’t open or start.
  • It’s possible to retro-fit transponder systems to cars and if this is something that you want to do then you should speak to a professional auto locksmith for advice.
  • Replacement or additional transponder keys can be made by a professional auto locksmith.
  • Advances in transponder technology has led to the development of keyless entry and starting systems for vehicles.
  • In addition to vehicles, transponder systems are also used for gate opening, wireless alarm keys and wireless access systems.


If you are experiencing problems with your transponder key or simply need an additional or replacement key then please get in touch. At Eyden’s Locksmith we provide a comprehensive auto locksmith service and have many years experience and know-how about transponder systems.