H48 - Check Continuity Of Power Ground in HO2S Connector

- Key "OFF".

- Heated Oxygen Sensor(s) (HO2S) disconnected.

- Measure the resistance between the power ground test pins at the HO2S harness connectors and battery (-).

- Is the resistance less than 5.0 ohms?

Yes -- Replace HO2S heater relay. Reconnect all components. If symptoms still exists, return to Diagnosis by Symptom (Diagnostic Routines).

No -- Service open in PWR GND. Reconnect all components. Do not rerun Quick Test.