4 Wire Oxygen Sensor Wiring Diagram. 4 wire o2 sensor wiring diagram from 2020cadillac.com effectively read a electrical wiring diagram, one has to learn how the components in the program operate. The wiring diagram calls it an af ratio sensor and the voltages i see do not resemble narrow or wide band o2 voltages.
By vallery masson on june 11, 2021. They work by producing their very own voltage by getting hot. The sensing element wires go to the pcm, in which one wire is signal ground and the second wire is signal voltage.