From my understanding, it still uses both o2 sensors in operation. Although it says use secondary, it is still using the first one as the primary. Like Spectacle said, you cannot set up lean protection without doing a PITA wiring job for an RSX sensor. It would be cool but I'd rather not lol.

 

Thats not correct. Kpro for an s2000 without the rsx wideband mod only uses 1 o2 sensor.

 

Figured it out.

Closed loop - unchecked
disable P0145 (o2 heater) - checked
secondary o2 sensor enabled - unchecked

No more CEL. Runs good - slightly rich while cruising, but we'll adjust that. As for lean protection, I guess it was never setup because like DFWs2k and spectacle said you can't utilize that feature with a pra calibration. Unless there was a way that my tuner figured out in my original map before the adjustments to partial throttle. I'll have to ask him.

Thanks for your help fellas

 

lol, well then your tuner knows more about the hondata product than hondata

glad you got most of it figured out

 

For the sake of clarity, I want to clear this up.

KPro for the S2000 can utilize both o2 sensors to pass emissions, both the stock primary and stock secondary. If you took a stock AP1, did the appropriate wiring and ECU swap to install KPro and nothing else, the car would still pass emissions with flying colors just like the stock setup.

Now come the caveats.

1 - Since the stock RSX ECU uses a primary wideband and a narrowband secondary and the AP1 S2000 uses both narrowband sensors, the option "use secondary as primary" is in the software. Hondata's explanation on this is hard to understand at first glance, but remember its only swapping the inputs at ECU (in software), not the functions of the o2's themselves. The PRA calibrations are sourced from Euro CTR's which used both narrowband o2 sensors, which is why you have to run that calibration with a S2000.

2 - IIRC disabling the secondary o2 will not allow you to achieve a OBD2 readiness code of "ready" (what you need to pass emissions) if the secondary o2 sensor is disabled. This option simply ignores the CEL code an improperly functioning secondary o2, which is what most of us want unless you are trying to pass emissions.

Hope that helps

 

Thanks for the clarification. So with the way I have it setup, I will not get a CEL for an improperly functioning secondary, but my CEL will still work for other notifications correct?

 

yes