3. Check HO2S Heater Resistance

1. Turn ignition switch to OFF position and disconnect HO2S connector.
2. Measure resistance between terminals 5 and 6 of the HO2S connector.
   Fig 1: Measuring HO2S Heater Resistance

   Courtesy of HYUNDAI MOTOR CO.
   • 9Ω at 20°C ~ 24°C (68°F ~ 75.2°F) 

Is resistance within specification? 

Yes: Go to next step.

No: Replace HO2S.