98 honda passport p0154

I've replaced all four sensors and this code came back. Bank 2 sensor 1 is stuck on 450mv. The other 3 fluctuate but not normal rate. I get 3 almost 4 volts out of the high and low signal wire on both bank 2 sensors I have yet to check bank one. I checked for continuity from pcm high and low signal to o2 sensors, on b2s1 I have continuity only to high signal. B2s2 I have continuity to both signal wires. I also have ground and 12v out of the other 2 wires. I think the pcm is bad but I'll check more tomorrow