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2. Check HO2S Heater Resistance

Turn ignition switch to OFF position and disconnect HO2S connector.
Measure resistance between terminals 3 and 4 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.