Sensor Heating Element Test

Use an ohmmeter to test the heating element of the oxygen sensors:
- Disconnect the electrical connector from each oxygen sensor.
- The white wires in the sensor connector are the power and ground circuits for the heater.
- Connect the ohmmeter test leads to terminals of the white wires in the heated oxygen sensor connector.
- Replace the heated oxygen sensor if the resistance is not between 4 and 7 ohms.