Heated Oxygen Sensor 2: Description
WARNING: This page is about a different car, the 2019 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.
The heated oxygen sensor 2, after three way catalyst 1, monitors the oxygen level in the exhaust gas on each bank.
This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1 V in richer conditions to 0 V in leaner conditions.
If a malfunction occurs in air fuel ratio (A/F) sensor, air fuel ratio is controlled to become a theoretical air fuel ratio by heated oxygen sensor 2.
Under normal conditions the heated oxygen sensor 2 is not used for engine control operation.