Heated Oxygen Sensor (Ho2S-2) Heater On-Vehicle Inspection: Heater

Disconnect sensor connector.
Using ohmmeter, measure resistance of sensor heater between terminals "V_B " and "GND" at sensor connector.
If found faulty, replace oxygen sensor.

NOTE: Temperature of sensor affects resistance value largely. Make sure that sensor heater is at correct temperature.

HO2S heater resistance

5.0 - 6.4 Ω at 20°C (68°F)

Fig 1: Identifying Heated Oxygen Sensor Connector Terminal
Courtesy of SUZUKI OF AMERICA CORP.
Connect sensor connector securely.