[marmit2017]

I recently got error codes for the cat converters, no SES light, just poor mpg and performance so had them changed. I want to verify that my O2 sensors weren't the culprit of the bad cats bc cats aren't supposed to be replaced for the life of the car. I have a 2009 BMW 328xi and here are the values with the engine running and up to operating temp. Are these values normal?

Ps: I get no codes for O2 sensors, and there are no vacuum leaks, BMW changed a secondary air hose so it's all good now.

[Delusive]

From my knowledge the values of the oxygen sensor should be jumping in voltage from 0.01 to 0.09, if the voltage stops jumping it means your sensor is dead.

[marmit2017]

Originally Posted by Delusive

From my knowledge the values of the oxygen sensor should be jumping in voltage from 0.01 to 0.09, if the voltage stops jumping it means your sensor is dead.

I was actually told to reset the adaptations then drive for a little then retest. So I'm going to do that then post. But the values were jumping

[hassmaschine]

Originally Posted by Delusive

From my knowledge the values of the oxygen sensor should be jumping in voltage from 0.01 to 0.09, if the voltage stops jumping it means your sensor is dead.

These are wideband sensors.. not narrowband.