Component Inspection

Inspection Condition	(+) Probe		(-) Probe		Reference
Inspection Condition	Connector	Terminal	Connector	Terminal	Reference
Engine "ON". (warm up condition)	HO2S (Bank1, Sensor1) connector	1 (nernst voltage)	HO2S (Bank1, Sensor1) connector	3 (virtual ground)	Fig.1
Engine "ON". (warm up condition)	HO2S (Bank1, Sensor1) connector	4 (trim resistor)	HO2S (Bank1, Sensor1) connector	6 (pumping current)	Fig.1

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 HO2S (Bank1, Sensor1) and go to "VERIFICATION OF REPAIR " procedure.