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Home › Kia › 2015 › Optima Hybrid › Repair and Diagnosis › Engine Performance › System › Engine Control System Diagnosis (1 Of 3) (HEV) › DTC P0135: O2 Sensor Heater Circuit-Bank 1 Sensor 1 › Wiring Inspection › Control Circuit Inspection

Control Circuit Inspection

  1. Ignition "OFF"
  2. Disconnect HO2S connector.
  3. Ignition "ON" & Engine "OFF"
  4. Measure voltage between Heater Control terminal (Pin No. 4) of the HO2S harness connector and chassis ground.

    Specification  : 4-5V

  5. Is voltage within the specification?

    YES 

    NO 

    • Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
      NOTE: HO2S must have a clean air reference to function properly. The air is obtained by way of the sensor wire (s). Do not attempt to repair the wire (s), connector, or the terminals.
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