O2 Sensor with 02-04 RSX (PPA) ECU in 05-06 RSX

[leick10]

I have an 02-04 RSX KPro v4 ECU (37820-PPA-A02) that I would like to install in an 05-06 RSX. This is not the modified 05-06 RSX ECU but I do have the Hondata 05-06 conversion harness. The car idles well without any fault codes or MIL but the AFR is reading extremely high (20:1 - 30:1) and the car misfires under load. I assume it is because the 02-04 Kpro ECU doesn't work with the stock 05-06 narrowband o2 sensor, nor can I simply plug in an 02-04 wideband o2 sensor without some rewiring. What are my options to use either the 02-04 wideband or the 05-06 narrowband with an 05-06 harness to the KPro v4? I've searched forums all over but haven't been able to find anything that makes me feel confident I won't damage the ECU. Thanks.

[Jakermac]

The 05-06 RSX engine will not run correctly with the 02-04 ECU. You need the modified ECU from Hondata for it to run correctly. There are sensor differences on the engine.