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Heated Oxygen Sensor Heaters No. 1 & 2

Turn ignition off. Disconnect Heated Oxygen (HO2S) sensor No. 1 or 2 pigtail connector. Using an ohmmeter, measure resistance between VB and GND terminals. See Figure . See HEATED OXYGEN SENSOR HEATER RESISTANCE  table. Replace HO2S if resistance is not as specified.

HEATED OXYGEN SENSOR HEATER RESISTANCE @ 68°F (20°C)

Application Ohms
Aerio
HO2S No. 1 2.0-6.0
HO2S No. 2 4.0-10.0
Esteem
HO2S No. 1 5.0-6.4
HO2S No. 2 11.7-14.3
Grand Vitara & XL-7 5.0-7.0
Vitara
With Warmup Three-Way Catalyst (1) 4.5-5.7
Without Warmup Three-Way Catalyst 11.7-14.3
(1) Applies only to HO2S No. 1.