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Home >> Kia >> 2020 >> Rio LX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (6 Of 6) >> DTC P2251-00: 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
  • Check open circuit of SR
  • Poor connector connection
  • Open circuit of O2 sensor
  • Faulty upstream O2 sensor
Enable Conditions
  • Internal resistance is highe than 950Ω
  • Normal sensor (pump cell)
Threshold Value
  • The sensor voltage is between 2.3V and 2.9V
Diagnostic Time
  • Immediate
MIL ON Condition
  • 2 driving cycles
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