2002 SPORT Trac P0174 & P0171

[smyrnagc]

My check engine light came on and the codes that are coming up are:

P0174 System Too Lean Bank 2
P0171 System Too Lean Bank 1

After some internet research I checked the air filter (ok); Cleaned the MAF sensor; Checked all vacuum lines (seem ok).

My Sport Trac has 75,000 miles on it and is the 4.0 6cyl.

Any recommendations of things to check or links to precious posts would be greatly appreciated.

Thanks

Hal/Tennessee

 

[smyrnagc]

One more thing...No rough idle or loss of gas mileage. Runs fine and still gets the same gas mileage.

I had a mechanic at work tell me that bad gas can sometimes cause this or carbon build up. He suggested running STP injector cleaner through it.