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Home >> Hyundai >> 2021 >> Ioniq Plug-In Hybrid Limited >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (PHEV) (3 Of 3) >> DTC P2251: O2 Sensor Reference Ground Circuit/Open (Bank 1 Sensor 1) >> Wiring Inspection >> Virtual Ground Circuit Inspection

Virtual Ground Circuit Inspection

  1. IG "OFF" and disconnect HO2S (S1) connector and ECM connector.
  2. Check resistance between Virtual Ground terminal of HO2S (S1) Connector and Virtual Ground terminal of ECM connector.

    Specification:  Below 1Ω

  3. Is the measured resistance within specification?

    YES 

    NO 

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