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Home >> Hyundai >> 2021 >> Tucson Value, FWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Control System Diagnosis - 2.0L (3 Of 3) >> 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
  • Electrical check (Circuit continuity check)
  1. Poor connection or damaged harness
  2. Open in HO2S control circuit
  3. Front HO2S
Enable Conditions
  • Sensor voltage is higher than 1.47V and lower than 1.53V.
Threshold value
  • Internal resistance is higher than 950Ω.
Diagnosis Time
  • Immediate
MIL On Condition
  • 2 Driving Cycles
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