Monitor Scantool Data

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

Fig 1: Display - Front HO2S And Rear HO2S Normal Graph (At Idle)
Courtesy of HYUNDAI MOTOR AMERICA

Normal graph of front HO2S and rear HO2S at idle. Refer to Fig 1.
Is parameter displayed "Present fault"?
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 "TERMINAL AND CONNECTOR INSPECTION " procedure.