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Home >> Kia >> 2021 >> Niro Plug-In Hybrid EX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (PHEV) (2 Of 6) >> DTC P0139-00: O2 Sensor Circuit Slow Response (Bank 1/Sensor 2) >> Wiring Inspection >> Basic Inspection >> Inspection Procedure

Inspection Procedure

  1. Check fuses and relays.
  2. Check auxiliary battery terminals and charge status.
  3. Check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

    Good 

    No Good