2016 Kia Cadenza BaseFACTORY OEM SERVICE PROCEDURE

Component Inspection

■ Check HO2S 

  1. IG "OFF". Disconnect HO2S connector.
  2. Check that the HO2S is securely installed.
  3. Check the HO2S for contamination or damage, water intrusion in connector, incorrect fuel pressure, VAC leaks.
  4. Is the sensor normal?

    YES 

    • Go to "Check the Signal waveform of HO2S" as below.

    NO 

    • Substitute with a known - good HO2S and check for proper operation. If the problem is corrected, go to "VERIFICATION OF VEHICLE REPAIR " procedure.

■ Check the Signal waveform of HO2S 

  1. IG "OFF". Connect HO2S connector.
  2. Connect probe to HO2S to measure signal waveform using oscilloscope function. Start engine.
  3. After warming-up, monitor signal waveform of HO2S with GDS.
    Fig 1: Screen Display - Normal Waveform Of Front HO2S And Rear HO2S At Idle
    G11790176Courtesy of KIA MOTORS AMERICA, INC.
  4. Is the sensor switching properly?

    YES 

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

    NO 

    • Substitute with a known - good HO2S and check for proper operation. If the problem is corrected, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Chapter Navigation
Return to Chapter: DTC P0154: O2 Sensor Circuit No Activity Detected (Bank 2/Sensor 1)
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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.