Question about Ford F-150

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I have a 2004 ford f-150 heritage xlt. check engine light came on and codes are po171 and po174. my book tels me its system adaptive fuel too lean (bank1and2). how should i start my problem solving?

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  • 378 Answers

Check bank 1 and bank o2 sensor wires make sure a mouse didnt chew them up most wires are soy based and them mouses chew them and make homes in the cabin filter in stuff if not you got bad o2 sensors

Posted on Dec 02, 2012

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: CHECK ENGINE LIGHT CAME ON P0171 FUEL TRIM BANK1 SYSTEM TO LEAN.

Hi. You need to clean the Mass Air Flow Sensor.
This is an easy job.
Get a can of throttle body or brake cleaner spray at your local auto parts store.

Open the hood, and locate the air filter box. follow the tube from the filter box towards the engine. Look for a small black box with 2 screws holding it to the air tube, Remove the wire connector and observe inside the sensor with a flashlight. You will see 2 small wires, and they will appear fuzzy or dirty. Spray the interior with the cleaner until the wires are nice and clean. Do not use compressed air, you will damage the sensor. Put it all back together and drive it.
This will def fix your issue. This is a vey common problem. If you do it yourself, you will save 70 + bucks.

Thanks for choosing FixYa, and a FIxYa rating for my assistance would be greatly appreciated.

Posted on Jan 23, 2009

  • 290 Answers

SOURCE: ford windstar codes po171 and

Try cleaning the MAF. Here is more info on the codes:
http://www.aa1car.com/library/ford_lean_codes.htm

Posted on Apr 14, 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

pippall
  • 1486 Answers

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

change the air fow senser.

Posted on Jul 06, 2009

angelodermos
  • 5 Answers

SOURCE: 2001 Ford Windstar, check engine light has been on

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)

Posted on Aug 05, 2009

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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 .

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).
_______________
FGTech Galletto 2-Master

Nov 08, 2012 | 2004 Suzuki Verona

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

How do I troubleshoot service engine codes for 2002 Ford F-150: PO174 and PO171?


This is the engine lean code. Too much air is entering the engine. Intake manifold gaskets can leak, vacuum lines get old and crack. Check the operation of the EGR and PVC valves, In short it is not easy to find the problem.

Sep 30, 2010 | 2002 Ford F150 Regular Cab

1 Answer

I GOT 2 FAIL CODES 0n my Ford Ranger 2004. PO171 system to lean bank number 1 and PO174 system to lean bank number 2. What is wrong, how to fix that ?


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.

Aug 07, 2010 | 2004 Ford Ranger

1 Answer

Lack of fuel when accelerating


This might help. It looks like you O2 sencor had gone bad or the signal has and causing multiple mis fire. according to your codes. 
PO171 System too Lean (Bank 1

PO174 System too Lean (Bank 2)

PO300 Random/Multiple Cylinder Misfire Detected

Causes of PO300
Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns

I'ld start with chaning the O2 sensors first but sheck for bad wire connection. Hope this helps and good luck

Apr 08, 2009 | 2004 Ford F150

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