1264 - Oxygen Sensor Heating

Check the heater element resistance between terminals 3 and 4 in the sensor side of the connector. If the element is electrically open (no continuity), replace the sensor.

NOTE: The oxygen sensor heater relay is mounted in the electronics box (E-box) in the right rear of the engine compartment. The heater relay is energized with positive (+) battery voltage from the DME main relay and a switched ground from the ECM.