Workshop Repair Manuals

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V90 L6-2.9L VIN 96 B6304S (1998)

Powertrain Management > Computers and Control Systems > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Description and Operation > Front Heated Oxygen Sensor > Page 1864

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Oxygen Sensor: Description and Operation
Rear Heated Oxygen Sensor

The rear heated oxygen sensor (HO2S) is located downstream of the three-way catalytic converter (TWC) which measures the oxygen content of
exhaust gases there.

This is to:

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provide more accurate fuel trim

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check for aging in the front heated oxygen sensor 

^

check that the three-way catalytic converter is working.

Powertrain Management > Computers and Control Systems > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Description and Operation > Front Heated Oxygen Sensor > Page 1864

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