Heated Oxygen Sensor (Ho2S)

There are 2 primary Heated Oxygen Sensors (HO2S) located in front of each catalytic convertor. There are 2 secondary HO2S located after each catalytic convertor. Start engine an operate at normal operating temperature. Replace HO2S if output voltage is not as specified. See HEATED OXYGEN SENSOR (HO2S) OUTPUT VOLTAGE table.

HEATED OXYGEN SENSOR (HO2S) OUTPUT VOLTAGE

Condition

Volts

Primary HO2S

⁽¹⁾ 100-900 mV

Secondary HO2S

⁽²⁾ 200-650 mV

⁽¹⁾	Voltage should switch from high to low and back at approximately 0.5 Hz.

⁽²⁾	Voltage should be static or change high to low and back slowly.