Hondata

I have a European 2003 S2000 with kpro4 and it has been running good for years.
Recently on cold start I sometimes get the P0453 code, which is EVAP system pressure sensor high input.
I'm pretty sure there is no such sensor on my car, since this ecu is for a RSX I'm not sure if this CEL is triggered by something else?
So far it has only triggered on cold starts and usually I can clear it right away, today it took a few minutes and a few tries though.

Car is supercharged with AEM 340 fuel pump (wired from battery with separate relay) and lots of other non OEM parts which might have caused some problems.
It's running on E85 and does struggle to get started when cold so I feel like it might be connected with the CEL.

Post your calibration.

This is my latest calibration: https://drive.google.com/file/d/1ImJUvD ... sp=sharing

As you have the purge system enabled, that could be the cause.

Yes I have always had that enabled, I'm thinking if it was disabled this CEL might appear not the other way around.
Not sure where to move forward but I guess I will check purge solenoid and maybe the canister as well.

You can try disabling it.