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Home >> Kia >> 2019 >> 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
  • Open in circuit
  • Poor Connector Connection
  • Open in Upstream O2 Sensor Control Circuit
  • Defected Upstream O2 Sensor
Enable Conditions
  • Internal resistance higher than 950Ω
  • Internal resistance signal is valid
Threshold Value
  • Sensor voltage is between 2.3 and 2.7V
Diagnostic Time
  • Immediately
Mil On Condition
  • 3 driving cycles
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