Downstream Sensor

Heated Oxygen Sensor Check:

1. Disconnect the heated oxygen sensor connection
2. Check that there is continuity between following terminals:
- Front bank side -- terminals 1 & 3
- Rear bank side -- terminals 3 & 4
3. If there is no continuity, replace the heated oxygen sensor.

NOTE: If the scan tool does not display the standard value although no malfunction is found by the above-mentioned continuity test and harness check, replace the heated oxygen sensor.