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Home › Kia › 2017 › Niro EX › Repair and Diagnosis › Engine Performance › System › Engine Control System Diagnosis (3 Of 6) › DTC P0420-00: Catalyst System Efficiency Below Threshold (Bank 1) › System Inspection › O2 Sensor Inspection

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 
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