O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)
The rear lambda sensor, after the catalyst, checks that the catalyst works.
What the car has detected
The rear sensor signal does not move: it is not working, not heating or its wire is broken.
It is not dangerous and the car drives the same, but the catalyst monitoring does not work and it may fail the inspection. Have it checked when you can.
Symptoms
- Engine warning light on
- May fail the emissions test
Possible causes
- Broken or shorted wire, or a loose or corroded connector
- Worn or faulty oxygen sensor
Checks for the garage
- Check the sensor wiring and connector
- Compare the live data reading with the expected one
Next step
Ask for the rear lambda sensor and its wiring to be checked before it is replaced.
You can keep using the car and book a visit without hurry.