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Home >> Kia >> 2016 >> Optima Hybrid >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (3 Of 3) (HEV) >> DTC P2251: 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
  • Electrical Monitoring
  1. Poor Connector Connection
  2. Open in Upstream O2 Sensor Control Circuit
  3. Defected Upstream O2 Sensor
Enable Conditions
  • Sensor Pump Current Valid
  • Battery voltage higher than 11V and lower than 16V
Threshold Value
  • P0135 detection and upstream O2 sensor voltage less than 2.1V and higher than 1.9V 5 sec. during internal test
  • Sensor signal stuck at lambda = 1
  • Upstream O2 Sensor voltage less than 2.1V during fuel cut off
Diagnostic Time
  • 15 sec.
MIL ON Condition
  • 2 Driving Cycle
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