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Home >> Kia >> 2020 >> Soul GT Line Turbo >> Repair and Diagnosis >> External Pages >> Different car >> Section 86 (Engine Control System Diagnosis - 2.0L (4 Of 6)) >> DTC P0420-00: Catalyst System Efficiency Below Threshold (Bank 1) >> DTC Information >> DTC Detecting Condition

DTC Information: DTC Detecting Condition

WARNING: This page is about a different car, the 2021 Kia Soul. 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
  • Exhaust system
  • Faulty downstream O2 sensor
  • Catalyst converter
  • Out of range ECT sensor
  • Exhaust manifold
  • High fuel pressure
  • Incorrect connection
  • Misfire
  • Injector
  • EGR system
Enable Conditions
  • Coolant temperature is higher than 55°C (131°F)
  • Modeled catalyst temperature is higher than 445°C (833°F) and lower than 925°C (1697°F)
  • Vehicle speed is higher than 8km/h (5MPH)
  • Engine speed is higher than 1200 RPM and lower than 3300 RPM
  • MAF is higher than 0.11g/stroke and lower than 0.45g/stroke
  • Ambient pressure is higher than 75kPa
  • Canister load is lower than 0.5
  • Lambda control active and Stable driving condition
  • Downstream O2 sensor operative readiness
  • No opening/closing of Canister Purge Valve
  • No relevant failure
  • Battery voltage is higher than 11Vand lower than 16V
Threshold Value
  • Average malfunction index is higher than 1
Diagnostic Time
  • 25 lambda controller cycles
MIL ON Condition
  • 2 driving cycles