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Home >> Hyundai >> 2021 >> Elantra N Line, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 33 (Engine Control System Diagnosis - 2.0L (Except HEV) (2 Of 6)) >> DTC P0139-00: O2 Sensor Circuit Slow Response (Bank 1/Sensor 2) >> DTC Information And Inspection >> DTC Detecting Condition

DTC Information And Inspection: DTC Detecting Condition

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Item Detecting Condition Possible Cause
DTC Strategy
  • Reverse oxygen sensor reverse time detection when fuel cut is executed
  1. Poor connector connection
  2. Leak in intake or exhaust system
  3. Faulty fuel system
  4. Front and rear HO2S connections reversed
  5. HO2S contamination
Enable Condition
  • ECTS is more than 73°C (163°F)
  • Downstream O2 sensor readiness detected
  • Downstream O2 sensor pre-heating phase finished
  • Catalyst temperature model is more than 400°C (752°F)
  • Downstream O2 sensor signal is more than 0.6V at entry into fuel cut-off
  • No relevant failure
  • Battery voltage between 10 and 16V
Threshold Value
  • Average ratio between measured and maximum allowed rich to lean switching time entering fuel cut-off is higher than 1
Diagnostic Time
  • 4 valid fuel cut-off phases.
MIL ON Condition
  • 2 driving cycles
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