Jscan and oxygen sensor %???

[heretic]

not sure where to post this question, but here goes.
Using Jscan I was looking at the Oxygen % plus short & long trim values.
The one value seem way off maybe even not supported by my Jscan software its a licensed version.
Here is the screenshot. I have no MIL or DCT what do you think?
Oxygen sensors 2 & 4 value in percentages is wrong right?

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[Alx63]

AI says,

• Bank 1 Sensor 2 (Downstream): This sensor monitors catalytic converter efficiency and does not influence fuel trim decisions. As a result, STFT values are typically displayed as 99.2% or N/A on most scan tools, indicating the ECM is not using this sensor for real-time fuel corrections. This is normal and expected behavior.

 

[heretic]

Thank you

 

[gamesjamy]

From what I've seen, an O2 sensor can influence the air/fuel mixture even without a fault code, but it's not necessarily the main cause of an irregular idle. Perhaps it's worth comparing the real-time values from both banks and also checking the injectors or coils before replacing other parts. Have you tried analyzing the trims over time or only at a specific moment?

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