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Home >> Hyundai >> 2007 >> Accent GLS, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (2 Of 2) >> DTC Troubleshooting Procedures >> DTC P0420 Catalyst System Efficiency Below Threshold (Bank 1) >> DTC Detecting Condition

DTC P0420 Catalyst System Efficiency Below Threshold (Bank 1): DTC Detecting Condition

DTC DETECTING CONDITION AND POSSIBLE CAUSE

Item Detecting Condition Possible Cause
DTC Strategy
  • Oxygen storage capacity
  • Exhaust system
  • B1S2
  • Catalyst converter
  • ECM/PCM
Enable Conditions
  • Engine speed 1200 ~ 3000rpm
  • Engine load 15 ~ 50%
  • Catalyst temp. (model) 470 ~ 700°C (878 ~ 1292°F)
  • Purge factor (high load canister) ≤ 12
  • Closed loop control
Threshold Value
  • Amplitude of downstream O2 sensor signal > 0.5
Diagnostic Time
  • 60 sec
MIL ON Condition
  • 2 driving cycle

* B1S1: upstream oxygen sensor / B1S2: downstream oxygen sensor

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