I have a 1996 full size bronco with a 5.8 and i have a trob code of po155. I konw this is the code for the heater side of the sensor. I think i have the prob down to a open ground issue from the tests i have done. does anyone know of a good source to get a schematic for the o2 sensor? or any repair manuals that go more in depth on wiring issues, because the stuff i have just does not tell me enough info. if anyone can help please reply. thanks