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Home >> Hyundai >> 2017 >> Sonata Base >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 42 (Engine Control System Diagnosis - 2.0L (2 Of 3) (Except HEV)) >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1) >> DTC Information >> DTC Detecting Condition

DTC Information: DTC Detecting Condition

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Item Detecting Condition Possible cause
DTC Strategy
  • Check catalyst oxygen storage capacity by evaluating downstream O2 sensor fluctuations
  1. Exhaust gas leaks
  2. Faulty rear HO2S
  3. Faulty three way catalyst converter
Enable Conditions
  • Coolant temperature is higher than 74°C (165°F)
  • Catalyst temp. (model) is between 550°C (1112°F) and 930°C (1706°F)
  • Vehicle speed is faster than 5 km/h (3 mph)
  • Engine speed is between 1300 RPM and 3000 RPM.
  • Mass air flow is between 0.3 g/rev. and 1 g/rev.
  • Ambient pressure is greater than 70 kPa (700 hPa)
  • Canister load is less than 0.5
  • Lambda control active & Stable driving condition
  • Battery voltage is between 11 V and 16 V
Threshold Value
  • Average malfunction index is greater than 1
Diagnostic Time
  • 30 Lambda Controller Cycles
MIL On Condition
  • 2 Driving Cycles