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Home >> Hyundai >> 2015 >> Sonata Eco >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 125 (Engine Control System Diagnosis (1 Of 2) (HEV)) >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1) >> General Information >> DTC Detecting Condition

General Information: DTC Detecting Condition

WARNING: This page is about a different variant/trim than selected.
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 >73°C(163°F)
  • 550°C(1022°F)< Modeled catalyst temp<850°C(1562°F)
  • Vehicle speed >3mph
  • 1300< Engine speed <3200
  • 0.3g/rev.< MAF < 0.8g/rev.
  • Ambient pressure > 70kPa(700hPa)
  • Canister load < 0.5
  • Lambda control active & Stable driving condition
  • Downstream O2 sensor operative readiness
  • No opening/closing of Canister Purge Valve
  • No relevant failure
  • 11V < Battery voltage < 16V
Threshold Value
  • Average malfunction index > 1
Diagnostic Time
  • 50 Lambda Controller Cycles
MIL On Condition
  • 2 Driving Cycles