Syste!m too lean bank 1
 

So do I have a faulty o2 sensor, or is something else wrong?

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Stock or modded?

Sorry probably should have mentioned. Here is the mod list that for the engine:
Invidia N1 cat back
Invidia catted FP
Motiv OP
FT86SF catted header
AEM intake
ECUTek tune

Nothing has changed in a month or so. Just came on on the drive home from work today.

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Geez - hate to make guesses but it could be a ton of stuff. Maybe as simple as the sensor but possibly dirty or faulty injector(s). Maybe the tune needs a little tweak.

I'm going to step aside and let a pro give you better advice but I would start with the cheap stuff and move up the chain. Dealer might not be much help :)

Yea, i need to do another logging run anyway, so i figure ill monitor them at the same time. If the sensor was bad though, wouldnt the logs be skewed?

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Okay so I did some logging this evening and the afrs regularly went into the 15s. Also, every time I shifted or let off the gas (but NOT stopped in neutral) my afrs were exactly 20. I think this is just how the reading is done. This was using the Torque app for Android.

What is considered "too lean" for this car?

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I think this is too lean ;)
http://www.ft86club.com/forums/showthread.php?t=56141


I only pointed that out to show how long it takes to actually do major damage.

What fuel do you usually run?

PS - that sounds very lean to me :) Again - someone may tell me I'm wrong but crikey....

91 is the best I can get (easily) in my area. I feel like it's too lean too, but it's weird that I have been on this tune for a couple thousand miles and this just happened out of nowhere. I was informed, however that if it was the o2 sensor, a second code would be thrown as well, and I am assuming the same for a fuel injector, so I guess I'll get some EcuTek logs and hit up my tuner.

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Yes - and maybe get a read from something external to the vehicle on that AFR.

What has your MPG been like?

How do you read afrs external to the ecu?

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Device in the exhaust reads and calculates. Same way they used to measure emissions at the DMV before plugging into the OBD port...

I see. Hmm okay. I'll need to locate one of these devices, I suppose.

Good luck and take it easy until you figure it out. Something is def not right.

Also, if it means anything, Torque reads this for the "rediness":

http://imageshack.us/a/img820/606/46gp.png