I am selling a used but clean and undamaged, working MX5 ecu immobiliser transponder antenna coil ring.

This is positioned on the ignition key entry and picks up transponder chip information from the key to allow immobiliser - ecu communication. 

If you have just one transponder key it is a good idea to use a second antenna to create a demob part. This will give you peace of mind as if the only key is lost all parts, ecu, immob and keys will need to be replaced. The price of this part includes guidance on the manufacture of a demob if required.   

My picture shows the three possible types for the MK1/MK2/MK2.5 - please let me know which one you require.

any questions, please ask.