Oxygen Sensor: 1, 2, 3, 4 Wire O2 Sensor Wiring Diagram. An oxygen sensor wiring diagram is a drawing that shows how the oxygen sensor is connected to the vehicle’s electrical system. The diagram will show the location of the oxygen sensor, the type of sensor, and the color of the wires. The diagram may also show the location of other sensors and components that are related to the oxygen sensor.
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