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Home >> Genesis >> 2017 >> G80 5.0 Ultimate >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (1 Of 3) - 5.0L >> DTC P0139: O2 Sensor Circuit Slow Response (Bank 1/Sensor 2) >> DTC Information >> DTC Detecting Condition
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DTC Information: DTC Detecting Condition

Item Detecting Condition Possible Cause
DTC Strategy
  • Rationality check
  1. Poor connection
  2. B1/S2
  3. ECM
General Enable Conditions
  • Downstream O2S voltage before fuel cut is higher than 0.15V
  • Fuel cut off
  • EGT around downstream O2S is higher than 400°C (752°F)
  • Exhaust gas mass flow is higher than 22kg/h
  • Battery voltage is higher than 10.7V
  • Engine speed is between 1200 RPM and 3520 RPM
Threshold Value Case 1
  • Response Time is higher than 5.0 sec

    (Duration of Downstream O2S voltage from above 0.55V to 0.15V during fuel cut off)
Case 2
  • Transient Time is higher than 0.35 sec

    (Duration of Downstream O2S voltage from 0.4V to 0.2V during fuel cut off)
Diagnostic Time
  • -
MIL On Condition
  • 2 driving cycle
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