I have a AEM wideband and a Hondata KproV4 ECU, I've been running into an issue where on warm starts the ECU goes into closed loop in around 7 seconds and the wideband takes about 15 seconds to boot.
While booting the voltage the wideband spits out makes the ECU think that it is full rich so it trims fuel to the point the engine nearly dies.

To get around that I designed a hold-up circuit to prevent the wideband from resetting from brown outs during cranking.
I am also working on a companion board for it that will break out the analog inputs of the Kpro to an automotive connector as well as provide dedicated clean power and ground for each input and also an optional pull-up resistor for thermistor based temperature sensors.
Additionally I am considering adding a SD card slot and a processor that can datalog the analog inputs as well as datalog ECU sensor data sent over CAN.
(The onboard storage of the Kpro is very limited and has a limited number of write cycles)

 

Do you have the wideband wired on a starter interrupted power source?
Board looks nice but why not just use a constant power source with ignition on.