returning Po175 Po171 Lean codes on 2007 Mustang GT? - Ford Mustang Forum
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post #1 of 2 (permalink) Old 12-05-2019 Thread Starter
lstill's Avatar
Joined: Mar 2018
Posts: 14
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 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

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post #2 of 2 (permalink) Old 12-05-2019
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2 things come to my mind...yes, dump the K&N box and also be aware that the oil from the filter over time can and will contaminate the intake sensors causing false readings...likely not the current issue 2ndly, do a smoke test if the codes return after reinstalling the oem swag is you will then find it!

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