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Home >> Hyundai >> 2014 >> Equus Signature >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (1 Of 3) >> DTC P0159: O2 Sensor Circuit Slow Response (Bank 2/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. B2/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)
  • Exhasut gas mass flow is higher than 22kg/h
  • Battery voltage is higher than 10.7V
  • Engine speed is between 1200rpm and 3520rpm
Threshold Value Case1
  • Response Time is higher than 5.0 sec

    (Duration of Downstream O2S voltage from above 0.55V to 0.15V during fuel cut off)
Case2
  • 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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