Ground Circuit Inspection

Ignition "OFF".
Disconnect HO2S connectors.
Measure resistance between ground terminal of HO2S(B1S2) harness connector and chassis ground.
Specification : Approx. 0Ω

Fig 1: Measuring Resistance Between Ground Terminal Of HO2S (B1S2) Harness Connector And Chassis Ground
Courtesy of KIA MOTORS AMERICA, INC.
Is resistance within the specification?
YES
- Go to "SIGNAL CIRCUIT INSPECTION " procedure.
NO
- Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NOTE: HO2S must have a clean air reference to function properly. The air is obtained by way of the sensor wire(s). Do not attempt to repair the wire(s), connector, or the terminals.