STFT S2's %--NA

KilledbyKenne

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The downstream o2 sensors appear to be on and transmitting voltage. Is something turned off in the tune that is causing the STFT S2(%) to read NA? If so, what do I need to turn back on in the tune?

I'm a bit of a novice on the tuning side of things so I apologize if this seems like a very basic question.

IMG_20200407_062508.jpg


IMG_20200407_062525.jpg

Thanks.
 
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KilledbyKenne

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New mods consist of return fuel system and BA3500 MAF vs the stock MAF w/MAFIA. Like I said, I'm a novice but I assumed the old tune would not work here.
 

gt347mustang

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Oh, then yea your old tune wont work.

You'll need to have it tuned again or get in touch with whoever tuned it last. Theres nothing you can do within the handheld tuner to turn back on egr and o2 sensors.
 

KilledbyKenne

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So what is it that is actually turned off in the tune that causes the STFT S2 % to read NA? So I can explain to someone what I need fixed in the tune.

Previous owner is ther one that tuned it and he claims everything emissions related is turned on in the tune so maybe he just missed something for those 2 sensors to work?
 

gt347mustang

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Screenshot_20190814-152425_Torque (Lite).jpg

Get a generic scanner tool and check the status of all your monitors. Report back what they say, thatll help determine what is off versus not complete.

I used the torque app and a cheap wifi obd connector for the screenshot above.
 

KilledbyKenne

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View attachment 1632487
Get a generic scanner tool and check the status of all your monitors. Report back what they say, thatll help determine what is off versus not complete.

I used the torque app and a cheap wifi obd connector for the screenshot above.

So it'll either say "not available" (like yours) and that means turned off. Or "not complete" if they are on and just haven't had the necessary drive cycles to finish the tests?
 

gt347mustang

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So it'll either say "not available" (like yours) and that means turned off. Or "not complete" if they are on and just haven't had the necessary drive cycles to finish the tests?

Yes, there are multiple other status they can read but those are the important ones.
 

01yellercobra

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What mid pipe is on the car? I'm guessing the rear O2's are turned off. Those affect the catalyst and EGR setting.
 

KilledbyKenne

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What mid pipe is on the car? I'm guessing the rear O2's are turned off. Those affect the catalyst and EGR setting.

Catted magnaflow X-pipe.

So I'm not sure, which is why I'm on here displaying my ignorance, but if the scan tool live data shows voltage for the rear o2 sensors wouldn't that mean they are on? Or can they be on for monitoring but still have the communication for emissions purposes turned off? There may just be different layers to the programming that I don't know.
 

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