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Home >> Kia >> 2017 >> Soul Base, Standard Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnosis - 1.6L (1 Of 3) >> 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
Case 1 DTC Strategy
  • Transient time monitor (Rich to Lean).
* HMC Remark: Catalyst monitoring is done by Rich to Lean step only.
  1. Poor connection
  2. HO2S downstream (S2)
  3. PCM
Enable Conditions
  • Battery voltage greater than 11.0V
  • Engine speed between 1200 - 3520rpm
  • Exhaust Gas Temperature (EGT) around downstream HO2S greater than 425°C (797°F).
  • Integrated exhaust gas mass flow greater than 0.2 kg/h.
  • Exhaust gas mass flow greater than 10 kg/h.
  • Delta Exhaust gas mass flow greater than -15 kg/h and less than 15 kg/h.
  • Fuel system status: Fuel cut off.
  • Downstream HO2S voltage before fuel cut greater than 0.63V.
Threshold Value
  • Transient time (average): Minimum duration (1/Max gradient) of downstream HO2S voltage from 0.63V to 0.25V during fuel cut off greater than 0.30 seconds (3 times per driving).
Diagnostic Time
  • 3 valid fuel cut-off phases.
Case 2 DTC Strategy
  • Response time monitor (Rich to Lean) error will be stored immediately when exceeding the threshold once(3times monitoring).
Enable Conditions
  • Battery voltage greater than 11.0V.
  • Engine speed between 1200 - 3520rpm.
  • Exhaust Gas Temperature around downstream HO2S greater than 425°C (797°F).
  • Exhaust gas mass flow greater than 0.2 kg/h.
  • Exhaust gas mass flow greater than 10 kg/h.
  • Delta Exhaust gas mass flow greater than -15 kg/h and less than 15 kg/h.
  • Fuel system status: Fuel cut off.
  • Downstream HO2S voltage before fuel cut greater than 0.63V.
Threshold Value
  • Response time OSC integration of catalyst When downstream O2S voltage from 0.63V to 0.25V during fuel cut off greater than exhaust. mass flow.
Diagnostic Time
  • 3 valid fuel cut-off phases.
Case 3 DTC Strategy
  • Transient time monitor (Lean to Rich).
Enable Conditions
  • Battery voltage greater than 11.0V.
  • Engine speed between 1200 - 3520rpm.
  • Exhaust Gas Temperature (EGT) around downstream HO2S greater than 425 °C.
  • Integrated Exhaust gas mass flow greater than 0.2 kg/h.
  • Exhaust gas mass flow greater than 8 kg/h.
  • Delta exhaust gas mass flow greater than -30 kg/h and less than 50 kg/h.
  • Fuel system status: after a fuel cut off.
  • Downstream HO2S voltage before fuel cut greater than 0.15V.
Threshold Value
  • Transient time (average): Minimum duration (1/Max gradient) of downstream HO2S voltage from 0.25V to 0.63V after fuel cut in greater than 0.45 seconds (3 times per driving).
Diagnostic Time
  • 3 valid oxygen purge phases after fuel cut-off.
Case 4 DTC Strategy
  • Response time monitor (Lean to Rich) error will be stored immediately when exceeding the threshold once (3times monitoring).
Enable Conditions
  • Battery voltage greater than 11.0V.
  • Engine speed between 1200 - 3520rpm.
  • Exhaust Gas Temperature (EGT) around downstream HO2S greater than 425°C (797°F).
  • Integrated Exhaust gas mass flow greater than 0.2 kg/h.
  • Exhaust gas mass flow greater than 8 kg/h.
  • Delta exhaust gas mass flow greater than -30 kg/h and less than 50 kg/h.
  • Fuel system status: after a fuel cut off.
  • Downstream HO2S voltage before fuel cut greater than 0.15V.
Threshold Value
  • Response time OSC integration of catalyst when downstream HO2S voltage from 0.25V to 0.63V after fuel cut in greater than exhaust gas mass flow.
Diagnostic Time
  • 3 valid oxygen purge phases after fuel cut-off.
MIL ON Condition
  • 2 Driving Cycles.

* S1: Upstream oxygen sensor/S2: Downstream oxygen sensor

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