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Home >> Kia >> 2014 >> Optima EX >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnosis (3 Of 3) - 2.4L (Except HEV) >> DTC P2251: O2 Sensor Reference Ground Circuit/Open (Bank 1/Sensor 1) >> Wiring Inspection >> Terminal And Connector Inspection

Terminal And Connector Inspection

  1. Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
  2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
  3. Has a problem been found?

    YES 

    NO 

    • Go to next step as indicated below.
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