Question about 1998 Ford Expedition

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Check Engine Light

What do codes PO171 and PO174 mean?

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  • JOSEPH D'AMICO Jul 15, 2008

    CHECK ENGINE LIGHT IS ON I NEED TO KNOW WHAT THESE CODES MEAN PO171 PO174



  • Anonymous Jul 24, 2008

    I OWN 1998 FORD EXPEDITION. THE SER ENG LIGHT CAME ON FEW MONTHS AGO .THE MOTOR ONLY HAD 75000 MILES AT THAT TIME.THE SHOP TRIED EVERY THING IT JUST DOES NOT WANT TO GO AWAY.

  • Anonymous Oct 10, 2008

    i have my engine light on and off for a year i dont know what to do anymore.

  • Anonymous May 12, 2009

    PO171 AND PO174 CODES ON A 99 EXPLORER

  • Anonymous Mar 13, 2014

    2000 Silverado 5.3L codes po171, po174. what could be the problem?

  • Anonymous Mar 17, 2014

    CODES= PO171 & PO174

  • Anonymous Mar 29, 2014

    any info on what those codes are. I'm waiting for approval to transfer ownership

  • Anonymous Mar 30, 2014

    engine light on. po171, po420. Totyta corolla 2003. What is it and how much does it cost. My e-mail address is hedgenator@aol.com. another code id 420, os censor and 02 can you tell e what all this means?

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I had the exact same codes on my 2000 Navigator with a 5.4L eng just today. It was a vacuum on the top of the motor. The hose had deteriorated and caused an associated hissing sound and rough idle. Used a little duct tape, ops check good, no return faults.

Posted on Sep 11, 2008

My steering column is no good

Posted on Jul 23, 2008

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Autozone can tell you

Posted on Jul 21, 2008

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Po171 po174 code


Lean bank 1 and bank 2 , and throttle actuator system fault. Check reason for lean codes 1st, vacuum leak(s), air inlet boot and hoses, or low fuel pressure / clogged filter. Repair as needed then clear codes and recheck .

Jan 09, 2014 | Cars & Trucks

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2003 Ford Expedition check engine light on .Codes PO171 & PO174


This is a tough one could be mass air flow sensor ,oxyegen sensors,a fuel filter. a vacum leak, a pcv valve if i missed anything just google po 171 &174 look for fix ya this issue has been addressed many times first check the vacum lines includeing the line on the pcv valve for cracks or splits in the lines .I would do the fuel filter if it hasnt been changed in the last couple of years , if still a problem the MAF sensor if your happy with my advise please leave me with great feedback

Feb 18, 2013 | 2003 Ford Expedition

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2003 Ford Expedition check engine codes PO171 & PO174


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Feb 18, 2013 | 2003 Ford Expedition

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Check engine light is on and when tested shows codes PO174 and PO171


The P0171 means System too Lean (Bank 1) and P0174 means System too Lean (Bank 2).
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Nov 08, 2012 | 2004 Suzuki Verona

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Po171 po174 restricted performance


Common fault is leaking gasket on intake manifold towards the back, do you have the following symptoms - uneven idle - sudden cut out on idle but starts up again with no problem?
If so you will find a leak on the inlet manifold. The codes show a leak after the MAF- so this is the area to check. Hope this helps.

May 29, 2012 | 2003 Jaguar S-Type

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I HAVE A CODE PO463,PO174,PO175,PO171


There is a problem somewhere in the system relating to oxygen content coming from the intake manifold and or fuel delivery system.
from experience iv done alot of intake gaskets cause of these 3 codes po174,po175,po171 to find the problem i use a smoke machine with a cold engine, smokes comes right out of the intake gasket im sure theres other ways to chek it too

Read more: http://www.justanswer.com/questions/30tei-my-2001-isuzu-rodeo-recently-had-the-engine-light-come-on#ixzz0ks7l9XNW

Apr 12, 2010 | 2001 Isuzu Rodeo

1 Answer

2006 jeep wrangler code po174


Check wiring to sensors.

Jul 13, 2009 | 2006 Jeep Wrangler

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