EFIE for wideband o2 sensors
 

I have an Infiniti QX56 that has wideband o2 sensors, does anyone know where I can get an EFIE that will work on wideband o2 sensors?

It is not an EFIE but this should work.
https://www.innovatemotorsports.com/products/lc1.php
But I am pretty sure it is not exactly what you are looking for. I did not buy their USB to Serial cable and ran into problems programming mine even though it all looked good on the computer screen. I have not yet recovered from that mistake.