Question about 1997 Ford Econoline

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Diagonostic trouble codes reported p0171 p0174 p0302

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  • Anonymous Aug 25, 2008

    2002 EXPEDITION

  • leo 123 Oct 19, 2008

    chek light engine on,po171 code,bank 1,ford ranger

  • pepearro Dec 07, 2008

    where the PO171 bank 1

  • Kira Norris Jan 09, 2009

    I have a 2000 ford explorer I have had po303 on and off for 8months now a week ago i got po303.po171,po174 I have been trying to find help.Auto parts guy says most likely massairflow sensor but that is not cheap and I want to make sure before I just go changing things.

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Where the PO171 banco 1

Posted on Dec 07, 2008

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P0302 is cyl #2 misfire and the other 2 are lean or rich codes because of the misfire repair code P0302 first and the other 2 codes will most likley clear up.

Posted on Oct 22, 2008

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Posted on Jan 02, 2017

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SOURCE: diagonostic trouble codes reported p0171

P0171 is system too lean bank 1, P0174 is too lean bank 2, and 302 is misfire bank 1. Look for vacuum leaks. If you don't find them, put a vacuum gage on it can check. The P0171 is almost always a vacuum leak. If not other possibilities are front O2 sensor is too old and should be replaced (if mileage is greater than 100k then replace). Try injector cleaner. Misfires are usually bad spark plugs, but could possibly be caused by insufficient fuel. I've never had a car of mine in bad enough shape to have that error.

Posted on Oct 24, 2008

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System too lean on bank 1 and bank 2

Apr 22, 2014 | 2004 Ford Freestar

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I would like to know what these codes mean


P0171 System Too Lean (Bank 1)
P0174 System Too Lean (Bank 2)
P0301 Cylinder #1 Misfire Detected
P0302 Cylinder #2 Misfire Detected
P0304 Cylinder #4 Misfire Detected
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Is it usual to have both p0171 and p0174 codes report at same time


sounds like the guy at the dealer ship hit the wires to the o2 sensor changing the oil fiter

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Dtc p0302,p0171,p0174. van sputters like it wants to die.runs ok once you get going but wants to stall. what do i do?


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Diagonostic trouble codes reported p0171 p0174 p0302 2001 Taurus, only reports P0171


P0171 is system too lean bank 1, P0174 is too lean bank 2, and 302 is misfire bank 1. Look for vacuum leaks. If you don't find them, put a vacuum gage on it can check. The P0171 is almost always a vacuum leak. If not other possibilities are front O2 sensor is too old and should be replaced (if mileage is greater than 100k then replace). Try injector cleaner. Misfires are usually bad spark plugs, but could possibly be caused by insufficient fuel. I've never had a car of mine in bad enough shape to have that error.

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