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Home >> Hyundai >> 2014 >> Accent GLS, Standard Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (2 Of 2) >> DTC P0420: Catalyst System Efficiency below Threshold (Bank 1) >> DTC Information >> DTC Detecting Condition

DTC Information: DTC Detecting Condition

Item Detecting Condition Possible Cause
DTC Strategy
  • Oxygen storage capacity (Deterioration of Catalytic efficiency)
  1. Exhaust system
  2. S2
  3. Catalyst converter
Enable Conditions
  • Engine speed 1720~2800rpm
  • Engine load is higher than 21% and 63%.
  • Catalyst temp.(model) is higher than 932°F
  • Closed loop control
  • There is not misfire.
  • There is not malfunction on HO2S/PCSV/ECTS.
Threshold Value
  • Difference of 'amplitude of downstream O2 sensor' and 'amplitude of model signal' is higher than 0.7
Diagnostic Time
  • 100 sec
MIL ON Condition
  • 2 driving cycle

* S1: upstream oxygen sensor/S2: downstream oxygen sensor

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