2016 Mazda MX5 Miata Engine Control Unit. In good working condition from a 2016 Miata that was equipped with a manual transmission. This unit was removed from a fully running vehicle. This will need to be reprogrammed by the dealership to work for your immobilizer / key. Please verify that the part number listed below matches the part that you are replacing prior to purchase. You will need to reuse some of your existing hardware for installation.