HO2S6 - Check Power to HO2S Sensor Heater

- Key OFF.

- Disconnect the HO2S connector.

- Key ON.

- Measure the voltage at the PWR terminal on the HO2S harness connector.

- Is the voltage greater than 10 volts?

Yes -- Go to HO2S7. HO2S7 - Check HO2S Sensor Heater Ground

No -- Go to EEC Pinpoint Test VPWR. VPWR - Vehicle Power

If VPWR is OK, Service VPWR wire to HO2S sensor.