Moved to Duratec Performance Chat. Ford Focus Technical Chat is for discussions pertaining to maintenance, recalls, and vehicle repairs. This is the proper forum for discussions about performance modification to your engine.
I have one of those K&N's, and I have problems with lean codes. I think it might be related to something else, so we'll see what happens when I do some other maintenance I'm overlooking.
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Moderating everything now, let me know if I can help.
Originally Posted by the user formerly known as ZX3_Chick
You're special aren't you.