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Home >> Kia >> 2019 >> Optima EX >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnosis (5 Of 6) (PHEV) >> DTC P2251-00: O2 Sensor Reference Ground Circuit/Open (Bank 1 Sensor 1) >> Wiring Inspection >> Terminal and Connector Inspection
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Terminal and Connector Inspection

  1. Many malfunctions in the electrical system are caused by poor harness and terminals.

    Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

  2. Thoroughly check connectors for backed out terminal, improper mating, broken locks, looseness, poor connection, bending, corrosion, contamination, deterioration, damage or poor terminal to wire connection.
  3. Has a problem been found?
    G13163576Courtesy of KIA MOTORS AMERICA, INC.

    YES 

    NO