Hondata

This error has nothing to do with the secondary sensor. More than likely the primary sensor has been damaged and will need to be replaced.

Thank you for reply!
What about Primary sensor heater voltage that I posted? Why it is so low?
Looks like ground at A1 ECU pin is bad. Is there way to ...

2002 RSX with PRB and k24/k20 swap. Bought it recently with all this
Related calibration settings: Secondary O2 not enabled, OBDII functions disabled
Throwing P1166 after 10 secs of engine running.
Made some checks according to manual. Fuses, relay seem to be good.
Ended with this voltage reading at ...