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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
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O2 Sensor Inspection

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