Heated Oxygen Sensor (HO2S-1 and HO2S-2) Heater On-Vehicle Inspection
1) Disconnect sensor connector.
2) Using ohmmeter, measure resistance between terminals “VB” and “GND” of sensor connector.
If found faulty, replace oxygen sensor.
Temperature of sensor affects resistance value largely. Make sure that sensor heater is at correct temperature.
Resistance of oxygen sensor heater
HO2S-1: 5.0 – 6.4 Ω at 20 °C (68 °F)
HO2S-2: 11.7 – 14.3 Ω at 20 °C (68 °F)
Viewed from terminal side
1. Viewed from terminal side
3) Connect sensor connector securely.