H45 - Check HO2S Heater Relay Coil Resistance.

- Key "OFF".

- Heated Oxygen Sensor (HO2S) heater relay removed from power distribution box.

Heated Oxygen Sensor Heater Relay:

- Measure the resistance of the HO2S heater relay coil.

- Is the resistance between 90 and 110 ohms?

Yes -- Replace Powertrain Control Module (PCM). Remove breakout box. Reconnect all components. Rerun Quick Test.

No -- Replace HO2S heater relay. Remove breakout box. Reconnect all components. Rerun Quick Test.