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Home >> Kia >> 2014 >> Optima LX >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnosis (3 Of 3) - 2.4L (Except 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

DTC DETECTING CONDITION

Item Detecting Condition Possible Cause
DTC Strategy
  • Reference ground circuit open (VG)
  1. Poor connection or damaged harness
  2. Open in HO2S control circuit
  3. Front HO2S
Enable Conditions
  • 11V < Battery voltage < 16V
Threshold value
  • 1.9V < Signal < 2.1V for 5 sec during internal test
  • Symptom detected on no activity
  • Signal < 2.1V during fuel cut off
Diagnosis Time
  • Within 15 Seconds after related symptom detected.
MIL On Condition
  • 2 Drive Cycles
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