Component Inspection

Check Resistance

Measure resistance between heater power and heater control terminal of HO2S (S1) (Component Side)

ITEM SPECIFICATION

Item	Specification
Heater Resistance (Ω)	Approx. 3.2Ω ± 0.8Ω at 20°C (68°F)

Fig 1: Measuring Resistance Between Heater Power And Heater Control Terminal Of HO2S (S1)

Courtesy of KIA MOTORS AMERICA, INC.

Fig 2: Identifying Oxygen Sensor (UP) Connector Terminals

Courtesy of KIA MOTORS AMERICA, INC.

Is the measured resistance within specification?
YES
- Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage. So, check poor connections and the related circuit between ECM and component thoroughly. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- Substitute with a known - good HO2S (S1) and check for proper operation. If the problem is corrected, replace HO2S (S1) and go to "VERIFICATION OF VEHICLE REPAIR " procedure.