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4. Check Power To HO2S Heater

Turn ignition switch to ON position.
Measure voltage between terminal 5 of the HO2S harness connector and chassis ground.

Fig 1: Measuring HO2S Heater Supply Voltage
Courtesy of HYUNDAI MOTOR CO.

Specification : approximately B+

Is voltage within specification?

Yes: Go to next step.

No: Repair open or short to ground in harness.