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Home >> Kia >> 2023 >> Sorento Plug-In Hybrid SX Prestige >> Repair and Diagnosis >> External Pages >> Different car >> Section 31 (Engine Control System Diagnosis (PHEV) (05 Of 10)) >> DTC P0420-00: Catalyst System Efficiency Below Threshold (Bank1) >> DTC Information >> DTC Detecting Condition

DTC Information: DTC Detecting Condition

WARNING: This page is about a different car, the 2024 Kia Sorento. However, it is still accessible from the selected car via links, so may be relevant.
Item Detecting Condition Possible Cause
DTC Strategy
  • Check catalyst Oxygen Storage Capacity (OSC)
  • Exhaust system
  • HO2S (Bank1, Sensor2)
  • Catalyst converter
  • Out of range ECTS
  • Exhaust manifold
  • High fuel pressure
  • Incorrect connection
  • Misfire
  • Injector
  • EGR system
Enable Conditions
  • Engine speed is between 1200 and 3000 RPM
  • Engine load is between 18 and 90%
  • Catalyst temperature (model) is between 600 and 850°C (1112 and 1562°F)
  • Fuel system status is closed loop
  • Modelled catalyst temperature is lower than 35°C (95°F)
  • Catalyst mass flow is lower than 9.7g/sec
Threshold Value
  • Ratio of actual OSC to model OSC is less than 1.0
Diagnostic Time
  • 15s
MIL ON Condition
  • 2 driving cycles