2015 Kia Optima LimitedFACTORY OEM SERVICE PROCEDURE

Component Inspection

  • ■ HO2S Inspection 
    1. Visually/physically inspect the HO2S for the following conditions:
      • Ensure that the HO2S is securely installed. (Pigtail and wiring harness not making contact with the exhaust pipe)
      • Check for corrosion on terminals and terminal tension (at the HO2S and at the PCM)
      • Front HO2S for silicon contamination. This contamination will be indicated by a white powdery coating on the portion of the sensor exposed to the exhaust stream and this will result in a but false (high) voltage signal.
      • Fuel, engine coolant or oil contamination.
      • Use of improper sealant.
    2. Was a problem found in any of the above areas?

      YES 

      NO 

      • Substitute with a known-good component and check for proper operation. If the problem is corrected, replace component and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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