What does the second oxygen sensor do?
What does the second oxygen sensor do? A second oxygen sensor is now used downstream of the catalytic converter to monitor the converter's operating efficiency. On V6 or V8 engines with dual exhausts, this means up to four O2 sensors (one for each cylinder bank and one after each converter) may be used. Can a worn out O2 sensor be replaced? The electrical plug for both O2 sensors unplug from the chassis plug. New O2 sensors should have the same exact plug - ready to attach to your car. When you remove the O2 sensor, you will probably find that...