Monitor Scantool Data

Connect scantool to DLC (Data Link Cable).
Warm up the engine to normal operating temperature.
Monitor "HO2S (S1), HO2S (S2)" parameter on scantool.

Fig 1: Monitoring Oxygen Sensor (S1), Oxygen Sensor (S2) Parameter On Scantool
Courtesy of KIA MOTORS AMERICA, INC.

Fig 2: Scantool Display - Signal Waveform Of Oxygen Sensors
Courtesy of KIA MOTORS AMERICA, INC.
Are the parameters displayed correctly?
YES

Fault is intermittent, caused by poor contact in the sensor's and/or ECM's connector, or was repaired and ECM 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 OF VEHICLE REPAIR " procedure.

NO

Go to "SYSTEM INSPECTION " procedure.