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Home › Hyundai › 2017 › Elantra GT Automatic Trans › Repair and Diagnosis › Engine Performance › System › Engine Control System Diagnosis (3 Of 3) › DTC P2251: O2 Sensor Reference Ground Circuit/Open (Bank 1 Sensor 1) › DTC Information › DTC Detecting Condition

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
  • Sensor voltage is higher than 1.47V and lower than 1.53V
Threshold Value
  • Internal resistance is higher than 950Ω
Diagnostic Time
  • Immediate
MIL ON Condition
  • 2 Driving cycle
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