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Home >> Kia >> 2019 >> Niro FE >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (3 Of 6) (HEV) >> DTC P0420-00: Catalyst System Efficiency Below Threshold (Bank 1) >> System Inspection >> O2 Sensor Inspection
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

O2 Sensor Inspection

  1. Ensure that the sensor is securely installed
  2. Check for corrosion on terminals
  3. Check for damaged wiring

    Good 

    No Good