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So do you think since I’m getting the codes that I am that maybe I do have a exhaust leak? seeing as my afr is reading so low. Also I am not getting the codes p0420 or p0430 just the ones I mentioned in the original post.

Yeah its definitely the factory reading on my cluster. I have not read any ones AFR being as low as mine is that's why I'm concerned. It's definitely running rich i can smell the gas when I get out.

Damn maybe I shouldn't be complaining. Guess it could always be worse 😂

Yeah I think I figured a way to get the CEL to go away. I believe I just need to add defoulers to the rear O2 sensors. The tune is just so I can avoid averaging 11 MPG like I currently am lol.

Any input or advice?

your probably right lol

What's up guys, I recently installed a catless exaust system and of course my CEL came on. It's throwing the expected codes for the bank 1 and 2 o2 sensors and also a code for emission system leak detected. I haven't gotten it tuned yet. My only concern as of now until I get it tuned is my AFR...

I see this thread hasn't been updated for about 6 years but if your still tuning mustangs I have a 2015 GT that I need tuned to remove my CEL due to having straight pipes. Tired of seeing the light due to my o2 sensor.