H84 - Check HO2S Circuit Continuity

- Key Off.

- PCM connected.

- Suspect HO2S disconnected.

- Jumper HO2S Signal to VPWR at the HO2S harness connector.

- Scan Tool connected.

- Key On, Engine Off.

Heated Oxygen Sensor Codes And Test Pins:

- Access the correct HO2S PID.

NOTE: (HO2S displayed as O2S on Scan Tool.)

- Is the voltage reading greater than 3.50 volts?

YES -- REPLACE HO2S. COMPLETE PCM reset to clear DTCs. Clearing Diagnostic Trouble Codes


COMPLETE a HO2S Monitor Drive Cycle. Monitors, Trips, Drive Cycles and Readiness Codes

NO -- GO to H85. H85 - Check HO2S Harness Circuit For Short to VPWR and Ground