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Home >> Hyundai >> 2021 >> Veloster N Standard Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (3 Of 3) >> DTC P2251-00: O2 Sensor Reference Ground Circuit/Open (Bank 1 Sensor 1) >> Component Inspection >> HO2S Visual Inspection
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HO2S Visual Inspection

  1. Inspect the front HO2S for any silicon contamination. This contamination will be indicated by a white powdery coating and this will result in a bad false voltage signal. If contamination is evident on the HO2S, replace contaminated sensor with the new one and go to next step.
  2. Is sensor contaminated?

    YES 

    • Substitute with a known-good HO2S and check for proper operation. If the problem is corrected, replace HO2S and then Go to "Verification Of Repair " procedure.

    NO 

    • Go to next step.
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