Hondata

try www.car-part.com

it is version 4.

you have not posted a datalog showing the issue.

Are you trying to run closed loop from the wideband?

I believe the soldering of the pins are the most likely cause of the problems. We recommend all capacitors be replaced. You can purchase them at: https://hondata.com/accessories/capacit ... uage=en-gb

The ECUs are all different and do things differently.

It looks like there are a number of bad solder joints for the 14 pin rows for the s300, as the pins are not visible and the through hole vias may be damaged. You may need to use a different ECU.

What do you mean by a board?

The ECU cannot make the ignition go negative.

Post the calibration used as well as a datalog of when this is happening.

Post pictures of the soldering done on the bottom of the ECU for the s300.

Is J12 cut on the ECU?

If you have the wideband hooked up so it is datalogged, then it is running VERY rich, or the sensor is faulty as it is reading in the 7's.

How exactly do you have this wired?

The Mini replaced the larger version and they do the same thing.