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Home >> Hyundai >> 2017 >> Elantra Eco >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Control System Diagnosis - 1.4L (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
  • Circuit continuity check
  1. Poor connection
  2. Open or short power/ground in signal circuit
  3. S1
Enable Conditions
  • Internal resistance is higher than 950Ω
Threshold value
  • Sensor voltage is between 2.3V and 2.7V
Diagnosis Time
  • Immediate
MIL On Condition
  • 2 driving cycle
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