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Home >> Hyundai >> 2019 >> Ioniq Plug-In Hybrid >> 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) >> DTC Information >> DTC Detecting Condition
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DTC Information: DTC Detecting Condition

Item Detecting Condition Possible Cause
DTC Strategy
  • Rationality check
  1. Poor connection
  2. Open in signal circuit
  3. S1
  4. Fuel inflow to cylinder (Injector leak)
Enable Conditions
  • Closed loop fuel control
  • Battery voltage is between 11V and 16V
Threshold value
  • Virtual Ground circuit during disconnection
Diagnosis Time
  • -
MIL On Condition
  • 2 driving cycle
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