Data clarification / confirmation on SecO2.V

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GhostPipes
Posts: 3
Joined: Mon Jan 02, 2023 3:04 pm

Data clarification / confirmation on SecO2.V

Post by GhostPipes »

After upgrading the turbo on my 2021 2.0T 10AT I have an emissions error (P0139) on the secondary O2 Sensor. I think I can sort that out by looking at my Ktuner logs. I am hoping to confirm that when I am looking at data in a log that the "SecO2.V" is the voltage reading on the down-stream O2 sensor. I would also like to confirm that on this log the AFR is the product of the up-stream O2 sensor. Or, is the AFR an average between those two sensors?

I assumed I had damaged the down-stream O2 sensor when changing turbos, but I am seeing values of 0.03 to 0.76 on the SecO2.V, which I assume is the voltage. If so, that sensor seems to be working in the expected range (zero to one). To ask another way, is there a place to see the voltage signal from the up-stream O2 sensor? I searched the online resource, but did not find what I was looking for.
KTuner
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Joined: Mon Jul 22, 2013 8:13 pm

Re: Data clarification / confirmation on SecO2.V

Post by KTuner »

The secondary sensor isn't a wideband, so the wideband air/fuel ratio comes from the primary sensor. Secondary O2 sensor voltage is exactly that.
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