Component Inspection

Inspection Condition	(+) Probe		(-) Probe		Reference
Inspection Condition	Connector	Terminal	Connector	Terminal	Reference
Engine "Running". (Warm up condition)	HO2S (B1/S2) harness connector	1 (signal)	HO2S (B1/S2) harness connector	2 (ground)	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 downstream HO2S (B1/S2) and then Go to "VERIFICATION OF REPAIR " procedure.