Monitor Scan Tool Data

Ignition "OFF"
Connect scan tool and Ignition "ON".
Monitor the HO2S parameters and signal waveform on scan tool.
[P0420]

Fig 1: Scan Tool Display Screen - HO2S Parameters And Signal Waveform
Courtesy of KIA MOTORS AMERICA, INC.

[P0430]

Fig 2: Scan Tool Display Screen - HO2S Parameters And Signal Waveform
Courtesy of KIA MOTORS AMERICA, INC.
Are the signal of rear HO2S and waveform the same as that of the front HO2S?
YES
- Go to "SYSTEM INSPECTION " procedure.
NO
- Fault is intermittent caused by poor contact in the sensor' s and/or PCM' s connector or was repaired and PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "VERIFICATION VEHICLE REPAIR " procedure.