Sentra GXE L4-1.8L (QG18DE) (2000)
COMPONENT DESCRIPTION
The heated oxygen sensor 2 (rear), after three way catalyst, monitors the oxygen level in the exhaust gas.
Even if switching characteristics of the heated oxygen sensor 1 (front) are shifted, the air fuel ratio is controlled to stoichiometric, by the signal from the
rear heated oxygen sensor.
This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1 V in richer conditions to 0 V in leaner conditions.
Under normal conditions the heated oxygen sensor 2 (rear) is not used for engine control operation.
Heated Oxygen Sensor 2 Heater (Rear)
SYSTEM DESCRIPTION
The PCM performs ON/OFF control of the heated oxygen sensor 2 heater (rear) corresponding to the engine speed.