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HOMESERVICE MANUALSKIA2017RIO EX, 4D HATCHBACKREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM DIAGNOSIS (2 OF 3)DTC P0420: CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK 1)GENERAL INFORMATIONDTC DETECTING CONDITION
2017 Kia Rio EX, 4D Hatchback

General Information: DTC Detecting Condition

2017 Kia Rio EX, 4D HatchbackSECTION DTC Detecting Condition
Item Detecting Condition Possible Cause
DTC Strategy
  • Oxygen storage capacity (Deterioration of Catalytic efficiency)
  1. Exhaust system
  2. S2
  3. Catalyst converter
Enable Conditions
  • Engine speed 1720 ~ 2800 RPM
  • Engine load 21 ~63 %
  • Catalyst temp. (model) > 932°F
  • Closed loop control
  • There is not misfire.
  • There is not malfunction on HO2S/PCSV/ECTS.
Threshold Value
  • Difference of 'amplitude of downstream O2 sensor' and 'amplitude of model signal' > 0.7
Diagnostic Time
  • 100 sec
MIL ON Condition
  • 2 driving cycle
* S1: upstream oxygen sensor/S2: downstream oxygen sensor
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.