Question about 2001 Ford F150 Styleside SuperCrew

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Po171, po174 - 2001 Ford F150 Styleside SuperCrew

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Those codes are for "lean" fuel mixture conditions. Look for vacuum hoses or intake vacuum leaks. I asume that this is a 4.6 or 5.4 liter engine in which case there may be a problem with intake manifold gaskets leaking or injector "o" rings leaking. I would advise you to have it diagnosed by a qualified technician and verify the lean condition's cause. Other reason's for lean conditions can be low fuel pressure or bad fuel regulator. Or, possible clogged fuel filter. Ther is also a chance that the oxygen sensors may be causing this.
hope this helps

Posted on Oct 23, 2013

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Posted on Jan 02, 2017

csmock132
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SOURCE: 1996 ranger 4.0 codes po171 and po174 come up on the screen

Check for vacuum leaks, especially the intake manifold gaskets. If those are o.k., clean the Mass air flow sensor.

Posted on Apr 12, 2009

  • 1 Answer

SOURCE: 1999 ford windstar 3.8 eng miss

remove the plenum take out injectors have them rebuilt change your plugs should clearup problem.  
ps if you have blowby problem could come back in a few months of driving.

Posted on Jun 01, 2009

moparownr
  • 667 Answers

SOURCE: code po171 7 po174

your computer is reporting bank 1 and 2 too lean, usually caused by the mass air flow (MAF) sensor, you can usually clean this sensor and reset the light. Clean it with electric cleaner or brake cleaner, make sure it is dry before reinstalling, also take care not to damage it. Hope this helps, let me know

Posted on Jun 09, 2009

  • 831 Answers

SOURCE: Generic code PO171 system 2 lean bank 1 generic

This can be caused by a faulty mass air flow sensor

Posted on Jul 09, 2010

Ken17402
  • 615 Answers

SOURCE: 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

Posted on Feb 19, 2013

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