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Old 05-20-2010
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CEL on a Focus Help

My neighbor has a 03 focus with a 2.0

well yesterday it threw a CEL and she wanted me to check it out. I took it to Autozone to put a scanner on it and came up with a P0171 - System to Lean Bank 1.

The lady at autozone says that normally means needs a tune up. Well I know needing a tuneup wont throw a CEL for being Lean, It would be to rich correct?

Also does anyone know of any common causes for this CEL.

Any help would be appreciated.

THANKS,
Ben
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Old 05-20-2010
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Originally Posted by btm757 View Post
My neighbor has a 03 focus with a 2.0

well yesterday it threw a CEL and she wanted me to check it out. I took it to Autozone to put a scanner on it and came up with a P0171 - System to Lean Bank 1.

The lady at autozone says that normally means needs a tune up. Well I know needing a tuneup wont throw a CEL for being Lean, It would be to rich correct?

Also does anyone know of any common causes for this CEL.

Any help would be appreciated.

THANKS,
Ben
she is wrong.

next thing you need to do is determine which part of the fuel map (loaded or unloaded) is being compensated for by increased pulsewidth in your fuel trims. Check with a scanner the live data and see where your long term fuel trims are positive (because its adding fuel) - either at idle, or under load (like driving down the highway going 55)
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Old 05-20-2010
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oh

and I made this thread but none of the mods stickied it, which they should have.

https://www.ranger-forums.com/f18/ad...1-p0174-96793/
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Old 05-20-2010
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Awesome thanks for that. I told her what it might be and Unfortunately i dont have a scan tool... So she said she is gonna take it to AAA tomorrow... Ill let you know what it turns out to be.
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Old 05-20-2010
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Awesome thanks for that. I told her what it might be and Unfortunately i dont have a scan tool... So she said she is gonna take it to AAA tomorrow... Ill let you know what it turns out to be.
I would rather walk then own a car with no scanning software.
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Old 05-20-2010
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haha I wish I could afford a ford scan tool
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Old 05-20-2010
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haha I wish I could afford a ford scan tool
you don't need one. go buy any scanner for 100-200 that has live data and you can view the fuel trims. Fuel trims are so important.
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Old 05-20-2010
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Gotcha
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Old 05-20-2010
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fuel filter needs to be changed....

Go over to Focaljet or Focusfanatics Both websites are great.
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Old 05-21-2010
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MINE WAS A O2 SENCER
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