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Codes P0171 and P0174 #1508735 02/21/06 01:33 PM
Joined: Nov 2003 Posts: 55 8 864X4 OP CEG\'er
OP 864X4 CEG\'er 8 Joined: Nov 2003 Posts: 55	I recently replaced the Bank 1 upper O2. Then after about 3 weeks the CEL came on again and gave me the codes 171 and 174. What would cause both banks to run lean. I checked my fuel pressure and it is right at 40-44 idleing. I have cleaned my MAF, how can I test the MAF? 1998 Contour SE V6 MTX-75 Mostly Stock 1986 Ranger V6 4X4, the only mod: weight reduction by rust.

Re: Codes P0171 and P0174 #1508736 02/21/06 02:32 PM
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	Check for a broken hose, leaks at gaskets near the throttle body, EGR valve or exhaust. From TSB. Edit. From TSB. Do the cheap and easy ones first. P0171 - System Too Lean (Bank 1), P0174 - (Bank 2). 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 Last edited by Tony2005; 02/21/06 02:35 PM. "Always do the cheap and easy ones first." 1996 V6 ATX 96K miles

Re: Codes P0171 and P0174 #1508737 02/21/06 11:43 PM
Joined: Oct 2002 Posts: 2,408 R Rogerm60 Hard-core CEG'er
Rogerm60 Hard-core CEG'er R Joined: Oct 2002 Posts: 2,408	Originally posted by 864X4: how can I test the MAF? Best way is to get a real time scanner, preferably one with data logging. "Those who cannot remember the past are condemned to repeat it" -George Santayana

Re: Codes P0171 and P0174 #1508738 02/22/06 12:08 AM
Joined: Nov 2003 Posts: 55 8 864X4 OP CEG\'er
OP 864X4 CEG\'er 8 Joined: Nov 2003 Posts: 55	what one would you recomend? I was thinking of getting the one over here:http://www.obd-2.com. 1998 Contour SE V6 MTX-75 Mostly Stock 1986 Ranger V6 4X4, the only mod: weight reduction by rust.

Re: Codes P0171 and P0174 #1508739 02/22/06 12:10 AM
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	Originally posted by 864X4: what one would you recomend? I was thinking of getting the one over here:http://www.obd-2.com. Go for it. Works great. 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: Codes P0171 and P0174 #1508740 02/22/06 01:58 PM
Joined: Sep 2002 Posts: 1,788 St. Louis, MO P projectSHO89_dup1 Hard-core CEG\'er
projectSHO89_dup1 Hard-core CEG\'er P Joined: Sep 2002 Posts: 1,788 St. Louis, MO	Originally posted by SVTfrog: Originally posted by 864X4: what one would you recomend? I was thinking of getting the one over here:http://www.obd-2.com. Go for it. Works great. I have that one and have used it for around 4 years. Once you get the hang of how it works and what some of its advanced features are, it's about as handy as a shirt pocket. Don't be surprised if you end up doing an UIM/LIM rebuild to replace leaky gaskets. Steve 98 Contour SE Sport 2.5 Duratec ATX The wifey's car 89 Taurus SHO - 246K miles 94 SHO ATX - 190K 1997 F-150 5.4L ATX - The Workhorse 150K. ANY THREAD WITH "OMG" or "WTF" ETC IN THE TITLE WILL BE IGNORED!

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