Oxygen Sensor: 1, 2, 3, 4 Wire O2 Sensor Wiring Diagram. A 4-wire oxygen sensor wiring diagram is also called a universal O2 sensor wiring diagram. A four-wired oxygen sensor has four wires, two wires for the heater circuit and two wires for the sensing element. The sensing element wires go to the PCM, in which one wire is signal ground and the second wire is signal voltage.
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