I have a pr3 ecu with B18c swap. I just threw code 2. What is the deal.
damn dude i dunno. teg tips doesnt even have a code 2. sorry i cant help.
code 2 is for the “secondary O2 senor” Do you have a second O2 sensor run in anywhere or do you still just have one? I threw the same code after I put in my B16, VTEC still kicked and all, but couldn’t get rid of the code 2. I was just about to go get another O2 sensor put in when I put on a B17 intake manifold… now the code is gone 
Hope this helped. Good luck
So 1st gen b16’s came with 2 o2 sensors, one for each 2 primaries right? What other exhaust manifold has two o2 sensors in those positions. Will it run good with an o2 near the cat? What other options do I have? chip it?
I just wired up a non-obd PR3 ECU into a civic (same as far as wiring goes) so I am still fresh on it… Here is what you do.
It is quite simple. Just splice a wire into your O2 sensor wire and put it where the secondary O2 sensor plugs into the harness for the ECU. That way the primary and secondary O2 sensors will be reading off of the same sensor. Makes for an easy fix.
I dont remember what the pin-outs are for the O2 sensors, but it is really easy and only takes a few minutes to do.
Good luck.
Later,
BR
Heh, funny thing is a snapped the header so I welded together a 94 GSR header to fit with the cat. Now I have no o2 sensors. Should I just go buy another header and would I have to wire it down to an o2 by the cat? or should I weld in a bung somewhere on this GSR header?