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system to lean code 2012gt

906 views 2 replies 2 participants last post by  Price713GT 
#1 ·
I bought my first Mustang a couple months back and I have enjoyed it for the most part. a couple of weeks ago it threw the " lean codes"(Both banks). It had a K&N air filter on it when I bought it and apparently there was a leak. So they sealed it and said it should be okay but my "trims" were borderline so it's probably going to do it again..... so I bought a AFE magnum force stage two( I believe it's called) to start new and it threw the codes again. I've had the entire exhaust smoke tested they rechecked all the seals no leaks, but no definite answers. I have a Jon Lund tune, and after I datalogged it he said my fuel levels were perfect???this is very discouraging. I have since logged it again and will send it to him to see what he says. please help
 
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