returning Po175 Po171 Lean codes on 2007 Mustang GT?
Hey guys have an 07 Mustang GT 4.6 that runs amazing.....but I have "Lean on bank 1 and 2 codes that i clear and keep returning? I pulled upper plenum and made sure that there were no leaks at intake....new gaskets/coppercoat...It has a K/N intake instead of the standard air cleaner box.....just wondering if this would cause that.....checked vac lines all hoses look good? Any thoughts appreciated. Thanks