Try replacing fuel filter
Oxygen sensors may need replacement. As a part of the emission control system, they are designed to be replaced about every 100,000 miles (under normal circumstances).
The fuel mixture is wrong in both banks. Improper fuel to air mixture is called lean. Running a code test on the vehicle may show what could be causing the problem.
Running lean on both banks typically indicates a vacuum leak.1999-2003 Windstars are known for this, and Ford even issued a TSB (technical service bulletin) on how to deal with it.Sidebar: I just saw a "kit" that has all the parts for this repair for sale at of all places: Amazon. I think it was about $90.See "Related Questions" below for more
Any vacuum line connected to the plenum.
I don't know what this question is asking. Are you talking about a lien. What are you trying to do that the two different banks are indicating this?
Running Lean Limited is the business or management consultancy business based in BasingstokeIn automotive terms it means that the engine is not getting as much gas as it should.In running, it refers to body mass.
needs an O-2 sensor?
it is gay
running lean can cause your 400ex to backfire ..if it backfires on deceleration its lean ...if it pops on acceleration its running rich.====carb issues
P0171 System too Lean (Bank 1)
Bank 2 running too lean.
engine is running lean while eccelerating
Look for a vacuum leak.