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Home › Kia › 2016 › Rio EX, 4D Hatchback › 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) › General Information › DTC Detecting Condition

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: 1.47~1.53V
Threshold Value
  • Internal resistance > 950Ω
Diagnostic Time
  • 5 sec
MIL ON Condition
  • 2 Driving cycle
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