Question about 2002 Ford Explorer

3 Answers

Just changed the PLASTIC INTAKE on 2002 Ford Explorer its now has service engine soon. Pulling codes P0171, P0174, P0203. Does anyone know what this could be?

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  • Anonymous Nov 30, 2012

    How is an injector issue on one bank going to resolve fuel trim on the other?

  • montehammons Nov 30, 2012

    Good question, Pete. Don't have the answer. OK, Brian, Peter's solution is more thorough, suggest you follow it.

  • Anonymous Dec 01, 2012

    Your siggestion for the injector on the right bank was very good & correct if the injector stuck closed or failed but both banks were lean,so there was two issues. Old upstream O2 Sensors that may have slowed & set a code or set because the new ducting let in unmetered air & drove them lean. Your correct if the injector quit but some fords stick open when they get dirty,then you go rich,but only on one side of motor,then the pcm drives the fuel trim or pulse rich. Sort of have to keep your thing cap on. Like what is,isn't

  • Anonymous Dec 01, 2012

    Sorry Leaking injector would be rich condition & pcm drives fuel lean We looking for causes of lean when they may have been rich. I'm confusing myself,should have left this alone,anyway thanks for the nice remarks

  • montehammons Dec 01, 2012

    no prob., Peter. I recognize and credit experience and knowledge like yours when I see it. You helped me understand it better, too.

  • Anonymous Dec 01, 2012

    Welcome--- I'm no expert & try to learn whenever I can also

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3 Answers

Check your work for vacuum leaks,can't have any

Replace the front oxygen sensors, if they have 100,000
miles on them That is the 171&174 along with vacuum leaks
& worn out slow sensors

PO203 ---is a #3 injector issue

Listen to hear if it ticks-- like the others & compare
OHM readings to the others

Posted on Nov 30, 2012

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  • Ford Master
  • 14,036 Answers

P174 FUEL SYSTEM TOO LEAN CYLINDER BANK 2 AND CODE P203 CYLINDER 3 INJECTOR CIRCUIT MALFUNCTION. POSSIBLE CAUSES COULD BE DAMAGE OR SHORT IN CONNECTOR OR PCM NOT FIRING FUEL INJECTOR.

Posted on Dec 01, 2012

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  • Ford Master
  • 5,317 Answers

P0203 is "injector circuit malfunction, cylinder 3", Did you remove the injector harness when you replaced the intake? Try unplugging and reconnecting the injector connector on cylinder 3. Does it still plug in good, no pins bent in the connector?
The other codes indicate "system too lean" on both banks (sides) of the engine, so if you get the injector working on cylinder 3, it should clear up the lean running condition.

Posted on Nov 30, 2012

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Posted on Jan 02, 2017

  • 4 Answers

SOURCE: Code #P0171 & code #P0174

The intake manifold gaskets need replacement as well as the o-rings inside - if you call FORD they should be able to get you the correct parts.

Posted on Nov 05, 2008

  • 625 Answers

SOURCE: check engine light codes, p0171,

this fords have very comun problems with maf sensors geting contaminated, if you have not or can hear any vacium leaks, the problem is goin to be a conataminated mas air flow snsor (maf)
allow the engine to cold down for at least 15minutes and the remove the air filter hosing and inside has to have a sensor, clean the two liitle resistors inside with brake or carburetor cleaner, allow it to dry and reinstall it.
if this inf help please mark it as fixya ranking after you try what i said

Posted on Jun 30, 2008

  • 1 Answer

SOURCE: CODES P0171 & P0174 EMISSION SYSTEM SERVICE

if you have the 3.8 liter its more than likely bad intake manifold gaskets or a cracked manifold. Ford has had several TSBs on this issue. O2 sensors do not go bad as often as mechanics say they do. I have a 1999 that after 100 dollars at the parts store solved all lean conditions on the top end. The manifold has three parts to it. A lower aluminum that houses the butterfly blades for the variable intake runners( known vacuum leak were rods protrude at passenger side of lower bad bushings likely cause). Middle riser which uses oring seals which dry out and cause major vacuum leaks. upper is more or less the top cover which uses one large oring to seal. Hope this helps!

Posted on Apr 18, 2009

billandrade
  • 6 Answers

SOURCE: P2195 CODE ON 2003 FORD EXPLORER SPORT TRAC 4.O

Hello,
Very common concern with the Explorer, Explorer Sport Trac and Ranger with the 4.0l SOHC engine! The upper and lower intake manifold gaskets fail, causing vacuum leaks..It can be Extremely difficult to detect these leaks, because they only leak intermittently (usually in the AM after a cold soak)... As the engine warms up they seal back up! Sometimes the vehicle will idle rough, surge or stall after initial start up, then the symptoms will clear after it gets to operating temperature... Usually there will be no driveability symptoms at all, except the engine light coming on and setting lean codes.. The gaskets have been redesigned to correct this concern..


Bill Andrade Ford Master Technician/ASE Master Technician

Posted on Sep 22, 2009

  • 2841 Answers

SOURCE: ford explorer ,4 litre. have code of P0171

You could be right but before going to all that trouble of replacing the intake gasket take a close look at the MAF (Mass Air Flow) sensor. Also look for a vacuum leak downstream of the MAF sensor. The MAF sensor may be dirty especially if you are using an "oiled" air filter and it was over oiled. Remove the MAF sensor and clean it with electronic cleaner. Make sure it is dry before reinstalling. If it is damaged, replace it. Also replace the fuel filter as a partially clogged filter has been know to set this code on some vehicles. Check all vacuum hoses and replace as necessary.

Posted on Nov 14, 2009

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Aug 07, 2010 | 2002 Ford Explorer

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Windstar 2000 3.8. Runs fine. Checked for codes and got p0171 and p0174. Cleaned the MAF sensor. Went to erase codes and found the there is a third one in there now. p0113. What is wrong?


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Mar 30, 2010 | 2000 Ford Explorer

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Look on the passenger side of the intake at the rubber elbow attached to the big black plastic tube and then to the intake manifold. Make sure it is not sucking shut and maybe a small hole in the bottom of it.

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Code #P0171 & code #P0174


Look, man here is the deal:
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code p0171 - refer to the rear cylinder bank

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