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OBD 2 Code P0171 #1619632 07/29/06 03:24 PM
Joined: Mar 2003 Posts: 49 Alexandria, VA (9m south of DC... S shamun OP New CEG\'er
OP shamun New CEG\'er S Joined: Mar 2003 Posts: 49 Alexandria, VA (9m south of DC...	I recently had the CEL reset. The code was P0171. Engine fuel:air mixture is too lean. I did some research and found a decent website: http://autorepair.about.com/cs/faqs/l/bl175h.htm STOOPID question: Where do I start (easiest first)? PVC valve or hose? MAF sensor? Fuel filter? THANKS!! Shamun 96 GL-Sport 2.0L, MTX Bernardo Bourges' CTA CAI, Dmitri's SVT E0s rims, 205/55R-16, Dunlop SPs.

Re: OBD 2 Code P0171 #1619633 07/29/06 08:14 PM
Joined: Apr 2003 Posts: 1,085 Northern B.C. Canada W WestCoastAjax Hard-core CEG\'er
WestCoastAjax Hard-core CEG\'er W Joined: Apr 2003 Posts: 1,085 Northern B.C. Canada	Start with 'SEARCH', up next to 'MAIN INDEX' Forum is 'Zetec Maintenance' Search word is 'P0171' Date range is 'All Posts' Number of results is '250' When you are just about Cross-eyed.....you are half way there... Check for air & vacuum leaks 2012 Lotus Evora --------- 95 Mystique MTX - GONE 395,000 Kms --------- Both Zetecs '97 Contour Mtx - stock - GONE

Re: OBD 2 Code P0171 #1619634 07/29/06 10:01 PM
Joined: May 2002 Posts: 21,653 Albany, Georgia K Kremithefrog I have no life
Kremithefrog I have no life K Joined: May 2002 Posts: 21,653 Albany, Georgia	Clean the MAF sensor 98.5 SVT 91 Escort GT (almost sold) 96 ATX Zetec (i brake to watch you swerve) FS: SVT rear sway bar WTB: Very cheap beater CEG Dragon Run - October 13-15

Re: OBD 2 Code P0171 #1619635 07/30/06 01:43 AM
Joined: Jun 2005 Posts: 5,345 Virginia, USA T Tony2005 Addicted CEG\'er
Tony2005 Addicted CEG\'er T Joined: Jun 2005 Posts: 5,345 Virginia, USA	Originally posted by shamun: ...The code was P0171. Engine fuel:air mixture is too lean. ... Most times, it is a vacuum leak. Check for air leaks at hoses, gaskets. Spray with carb cleaner, if the idle changes, you found the leak. Clean MAF sensor. MAF sensor http://www.contour.org/mods/mods.php?s=howto&displayid=36 and http://www.contour.org/ubbthreads/showflat.php?Cat=&Board=zetecmaint&Number=989728&page=&view=&sb=5&o=&fpart=1&vc=1 and http://www.autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/1b/cb/25/0900823d801bcb25.jsp From TSB, P0171 - System Too Lean (Bank 1) The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The code is set when the adaptive fuel tables reach a rich calibrated limit. Fuel System: �?· Contaminated fuel injectors �?· Low fuel pressure or running out of fuel (fuel pump, filter, fuel supply line restrictions) �?· Vapor recovery system (VMV) Induction System: �?· MAF contamination �?· Air leaks between the MAF and throttle body �?· Vacuum leaks �?· PCV system concern �?· Improperly seated engine oil dipstick EGR System: �?· Leaking gasket �?· Stuck EGR valve �?· Leaking diaphragm or EVR Base Engine: �?· Exhaust leaks before or near the HO2S �?· Secondary air concern Powertrain Control System: �?· PCM concern "Always do the cheap and easy ones first." 1996 V6 ATX 96K miles

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