Question about 2001 Ford Windstar

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Check engine light on my 01 windstar when scaned the codes were po171 and po174 bank 1 and bank 2 too lean

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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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These two codes DO indicate a vacuum leak or low fuel pressure condition, but when they occur together it is usually caused by a faulty Mass Airflow Sensor. When the sensor fails to give a correct reading, the ECM tries to compensate air/fuel ratio to correct a condition that does not exsist, causing more air to be delivered, thus displacing the fuel that should be burning and causing a REAL lean condition. These 4.2L engines are also known to accumulate large amounts of oil and debris in the intake, causing the Isolator Bolt Grommets to harden and fail. If replacing the MAF sensor does not fix it, you can usually diagnose an intake leak with a smoke test done by a mechanic. The grommet leaks don't always show up, but you will see any other leaks that may exist. And small leaks around the PCV valve are the norm on these engines and do not normally cause issues since it is such a small amount of air.

Posted on Sep 16, 2012

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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 .

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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

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1999 chevrolet 1500 with a 5.3 engine engine light on had check had a code in it po171 and po174 sey burning to lean on bank 1 and bank 2 what should i check for did pass inspection


Running lean on both banks? Check intake tubing/hoses for loose clamps and cracks/tears aft of the mass airflow sensor. Could also be a fairly large vacuum leak.

Mar 06, 2011 | 1999 Chevrolet Silverado 1500

1 Answer

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


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

Nov 11, 2010 | 1997 Ford Expedition

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

2001 Ford Windstar, check engine light has been on for a while, but started flashing last night. It ran out of oil in 1 month's time. Brand new transmission 1 month ago, they told us that it had lean...


if the light is flashing it most like hasly some sort of misfire or converter failure, p0171 and p0174 is lean bank 1 and 2, replace you upper and lower plenum gaskets, while they have they off have they replace your ignition coil, plugs and wires, windstars are known for 2 things, lean codes,(plenum gaskets) misfire(bad ignition coil)

Jul 09, 2009 | 2001 Ford Windstar

1 Answer

1995 Windstar OBD II showing codes PO340, PO171, and PO174


Hello;
With those codes, the first place I would check is the fuel pressure. Also check the fuel filter and replace it if you haven't already. Then clear codes and recheck. Even if your fuel pressure is with in range it still may not push enough fuel to operate your vehicle.

Jan 15, 2009 | 1995 Ford Windstar

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