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Home › Hyundai › 2019 › Accent Limited › Repair and Diagnosis › Engine Performance › System › Engine Control System Diagnosis (3 Of 3) › DTC P2251-00: O2 Sensor Reference Ground Circuit/Open (Bank 1 Sensor 1) › DTC Information › DTC Detecting Condition

DTC Information: DTC Detecting Condition

Troubleshooting Condition Possible Cause
Main Action
  • 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.
Diagnosis Time
  • 5sec
MIL
  • 2 Driving Cycles
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