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Home >> Kia >> 2018 >> Forte EX >> Repair and Diagnosis >> External Pages >> Different car >> Section 136 (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

WARNING: This page is about a different car, the 2017 Kia Niro. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ensure that the sensor is securely installed
  2. Check for corrosion on terminals
  3. Check for damaged wiring
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