O2 Sensor Inspection

Inspection Condition	(+) Probe		(-) Probe		Reference
Inspection Condition	Connector	Terminal	Connector	Terminal	Reference
Ignition "ON", engine "ON". (Warm up condition)	HO2S (B1/S2) harness connector	1 (signal)	HO2S (B1/S2) harness connector	2 (ground)	Figure

Courtesy of KIA MOTORS AMERICA, INC.

Good

No Good

Carefully re-do this troubleshooting guide steps.
If no problems were found with the circuits or connectors, Replace the Three-Way Catalytic Converter and then go to "VERIFICATION OF REPAIR " procedure.