Component Inspection

Inspection Condition	(+) Probe		(-) Probe		Reference
Inspection Condition	Connector	Terminal	Connector	Terminal	Reference
Ignition "ON", Engine "ON"	HO2S (B1/S2) harness connector	1 (Signal)	Chassis ground	2 (Ground)	Figure below
Ignition "ON", Engine "ON"	HO2S (B1/S2) harness connector	4 (Control)	Chassis ground	-	Figure below

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 (B1/S2) and go to "Verification of Repair " procedure.