Question about 1997 Ford Expedition

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Check engine light is on codes are po171 system too lean (bank 1) po174 system too lean (bank 2) so what can i do

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Look for vacuum leaks,that are causing the O2 Sensors to go lean, and set codes on both banks

Posted on Nov 11, 2010

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Posted on Jan 02, 2017

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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

pippall
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SOURCE: hey i have a few problems with the cadillac deville 03

change the air fow senser.

Posted on Jul 06, 2009

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SOURCE: I GOT 2 FAIL CODES 0n my Ford Ranger 2004. PO171

Description : The adaptive fuel Strategy continuously monitors fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit. Now that we have an Idea of what the codes mean , we need to narrow them down. More than likely the problem is causing both codes to set. Keeping this in mind, lets concentrate on Code PO1309. Of the possible causes listed above I see two Sensors that may throw up a lean code. I would look at the MAF Sensor first and then the Temp Sensor. You may find that if you remove the internal Sensor from the MAF Case that some degree has collected on the thin wire. If you find debree, use a Q-Tip to clean it. DO NOT USE CHEMICALS TO CLEAN IT. If no debree is found, try a Known Good MAF Sensor. Still no fix, move on to testing the rest of the Sensors on the list till you find the problem. Keep in mind that the check engine light will have to be cleared after you have fixed the problem.

Posted on Jun 07, 2011

  • 67 Answers

SOURCE: check engine light on my 01 windstar when scaned

thats a lean code which mean there is a vaccum leak or fuel flow is low. can be the fuel filter, most likely it is a vaccum leak, spray with carb spray around the intake and the hoses and see if the idle changes

Posted on Mar 23, 2011

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Related Questions:

1 Answer

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

1 Answer

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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FGTech Galletto 2-Master

Nov 08, 2012 | 2004 Suzuki Verona

1 Answer

Check engine light with codes po171 po174


Both codes are system too lean bank 1 & bank 2. Most likely a vacuum leak. Check all vacuum hoses for broken, kinked, collapsed or missing.

Nov 02, 2010 | 2004 Ford F150

1 Answer

Generic code PO171 system 2 lean bank 1 generic


This can be caused by a faulty mass air flow sensor

Jul 06, 2010 | 1999 Ford Taurus

2 Answers

A po171 code came on my scanner i need to know


system too lean in bank 1. clean your mass airflow sensor, replace fuel filter. iff all else fails check you fuel pump.

Nov 06, 2009 | 1998 Ford Contour

1 Answer

PO171


P0171 - Fuel Trim System Lean Bank 1
YOU WILL NEED TO AVE THE DEALER TEST THE O2 SENSOR FOR PROPER SWITCHING, RIGHT NOW IT SHOWS ALWAYS LEAN, THIS MAY BE THE SENSOR OR THE ENGINE MAY REALLY BE LEAN ON FUEL AIR RATIO, AS FAR AS THE SMOKE GOES THE 2 ARE PROBABLY NOT RELATED, HOW MANY MILES ON CAR? IF THE MILES ARE HIGH THEN REPLACE THE O2 SENSOR ON THE CYLINDER BANK WHERE # 1 CYLINDER IS LOCATED, THE SENSOR IS THE ONE BEFORE THE CATALYTIC CONVERTER.

May 08, 2009 | 2000 Chevrolet Monte Carlo

2 Answers

What does engine fault code po171 system too lean bank 1 mean thanks


i think its the oxygen sensor (pre cat) in exhaust

Sep 23, 2008 | 2002 Nissan Altima

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