I was wondering if most all narrow band o2 sensors are created pretty much equil?
My cherokee seems to want to run at around 13.5 afr about 90-95% of the time once in closed loop. It will come up to around 14.7 for a while every now and then, but then usally adjusts itself back down to closer to 13.5.
I found that if I hooked the simulated NB output of my MTX-L to the ecm, once in closed loop it will stay at almost a perfect and steady 14.7. BUT, after a couple days, I get a error code for o2 sensor failure. I reset the pcm and all is well again for a couple more days. When I hook the NB back up, I never get any error codes, but I get the 13.5 afr.

So, could it be the bosch o2 sensor I am using? Are the output voltages different based on what applacation they are intended for? Its a 4 wire heated sensor, not from a chevy. You think swapping to a 3 wire ac delco (or something simillar) made for vehicle that came factory with a 7427 would help?
Thoughts, ideas?