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Home >> Hyundai >> 2012 >> Accent GLS, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (2 Of 2) >> DTC P2251: O2 Sensor Reference Ground Circuit/Open (Bank 1 Sensor 1) >> General Information >> DTC Detecting Condition
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General Information: DTC Detecting Condition

Item Detecting Condition Possible Cause
DTC Strategy
  • Circuit continuity check
  1. Poor connection
  2. Open or short power/ground in signal circuit
  3. S1
Enable Conditions
  • Sensor voltage is between 1.47V and 1.53V
Threshold Value
  • Internal resistance is higher than 950Ω
Diagnostic Time
  • 5sec
MIL ON Condition
  • 2 driving cycle
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