I have a 94 civic coupe with a jdm b16a swapped into it by the previous owner. I'm getting a cel code 43 (fuel supply code). Most people say that a bad o2 sensor will cause this code, but my car has no o2 sensors. Whoever swapped the motor I guess didn't run a wire for the o2 sensor. So how would I wire my car for an o2 sensor? Would I need to tap into another wire or run it directly to the ecu? By the way, I'm running a p30 ecu because it is the stock ecu for my motor, but it is chipped and socketed with ha motorsports parts. It's running a b16a basemap chip to disable the knock sensor, if that makes any difference

 

JDM B16As had knock sensors (mine did at least).

CEL 43 is a fuel supply code, likely not the CEL 1 or 41 for a missing O2 sensor.

Are you positive you don't have an O2 sensor at all? You should recheck your exhaust manifold and the exhaust prior to the catalytic converter.

If you want to wire in an O2 sensor, it is easy.


Original Honda Plug----Ecu pin/Function-------BoschO2------Xenocron harness

Orange/Black ---------Heater (ECU A6) -------White----------BROWN
Yellow/Black --------------12 Volt------------White----------YELLOW
Green/White --------------Ground ------------Grey-----------PURPLE
Grey(WHITE) ----------Signal (ECU D14) ------Black----------GREY