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Home >> Hyundai >> 2009 >> Tucson GLS, Standard >> Repair and Diagnosis >> Engine Performance >> System >> DTC Troubleshooting Procedures (2.0L) >> Troubleshooting for DTC >> P0139 O2 Sensor Circuit Slow Response (Bank 1/Sensor 2) >> DTC Detecting Condition
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P0139 O2 Sensor Circuit Slow Response (Bank 1/Sensor 2): DTC Detecting Condition

Item Detecting Condition Possible Cause
DTC Strategy
  • Slow response (Switching time check at entry in fuel cut off)
  • Leak in intake or exhaust system
  • Faulty fuel system.
  • Front and rear HO2S connections reversed.
  • Contact resistance in connectors
  • HO2S contamination
Enable Condition
  • Coolant temp >74°C (165°F)
  • Closed loop mode
  • 5km/h (3mph) < Vehicle speed < 180km/h (112mph)
  • Sensor preheating and full phase finished
  • Catalyst temp.model >350°C (662°F)
  • No relevant failure
  • 11 < Battery voltage < 16
  • Downstream O2 sensor signal at entry in fuel cut off > 0.55V
Threshold Value
  • Average ratio (between measured and maximum allowed switching time at entry in fuel cutoff) > 1
Diagnostic Time
  • 5 fuel cutoff phases
Mil On Condition
  • 2 Driving Cycles
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