Repair Procedures: Inspection

Turn the ignition switch OFF.
Disconnect the HO2S connector.
Measure resistance between the HO2S terminals 4 and 5 [B1/S1].
Specification: 2.5 ~ 4.0 Ω [20°C (68°F)]

Fig 1: Heated Oxygen Sensor (HO2S) Connector Terminals (B1/S1)
Courtesy of KIA MOTORS AMERICA, INC.
Measure resistance between the HO2S terminals 3 and 4 [B1/S2].
Specification: 3.3 ~ 4.1 Ω [21°C (69.8°F)]

Fig 2: Heated Oxygen Sensor (HO2S) Connector Terminals (B1/S2)
Courtesy of KIA MOTORS AMERICA, INC.
Check that the resistance is within the specification.