2. Check HO2S Heater Resistance

1. Turn ignition switch to OFF position and disconnect HO2S connector.
2. Measure resistance between terminals 3 and 4 of the HO2S connector.
   Fig 1: Measuring HO2S Heater Resistances

   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.