Question about Ford Ranger

1 Answer

Obd code P1131 and PO174

Stalls at idle when warm

1998 Ford F150 V6

Posted by on

  • 5 more comments 
  • chazmus Nov 14, 2008

    What is fuel system trim

  • lopezed819 Dec 15, 2008

    Have you resolve this issue? I have the same problem. ED

  • pbdh2006 Apr 08, 2009

    I have a 2002 Ford Escort and I have a P1131 code. The car is running ok for now.

  • Anonymous Mar 17, 2014

    1998 f150 with a v6 is missing bad but has no fault coded!!

  • Anonymous Mar 24, 2014

    stiped bolt

  • Anonymous Mar 24, 2014

    is there fuses in my starting system

  • Anonymous Apr 01, 2014



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.


    An expert that got 20 achievements.


    An expert that got 10 achievements.

  • Ford Master
  • 74,418 Answers

P1131 - Heated Oxygen Sensor (HO2S) Circuit Low Variance Bank 1 Sensor 2
P0174 - Fuel Trim System Lean Bank 2

Clean the MAF sensor and check for vacuum leaks at the intake manfold or the injector O rings.

Posted on Nov 13, 2008

  • yadayada
    yadayada Nov 14, 2008

    Trim is what the fuel system does to adjust for lean and rich conditions, this is normal, but when the system has to constandly trim rich or lean them there is a problem and the CEL will come


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

2003 f150 with a 4.6 eng. trouble codes po174 po125 po171 p1131 po136 po156 p1151

All of the codes you are getting except for one are indicating a running lean condition. This is most likely due to a vacuum leak or the pintle on the egr valve is worn out allowing exhaust gases to pass through all the time. If you have access to a monitor check the iac duty cycle as well as the dpfe sensor. If the iac is reading less than forty percent you have a vacuum leak. As well if the dpfe is reading above 1.13 volts the egr valve is bypassing. The last code you have is being caused by a faulty thermostat.

Sep 28, 2014 | 2003 Ford F150 Regular Cab

1 Answer

1998 Ford Contour 2.5 litre, 30,000 km. Started cold after sitting for a day in -20C temperature, and idles for little while then quits, and smells like gas. Idle speed fluctuated and surged up and down...

PO171 and P1131 point to lean codes on bank PO174 and P1151 point to lean code on bank PO305 is missfire on cyl 5

the lean codes is probably a vacuum leak or maybe a MAF sensor is bad or dirty

missfire is dependant on engine if a V10 it may be a coil actually pretty likely on the modulars not uncommon thats for sure
sorry forgot to add that its says missfire on #5 cant remember if that one is the first on the left or last on the left facing the engine vacummn leak could be those dang auto hubs got it stuck in the mud and they did not engage I need to buy some new ones took them apart to clean them out this summer

Dec 16, 2013 | 1999 Ford Contour

1 Answer


P1131 = Lack of HO2S11 switch - sensor indicates lean, ( upstream heated oxygen sensor )
This oxygen sensor is located before the catalytic converter, ( refered to as UPSTREAM )

P1151 = Lack of HO2S21 switch - sensor indicates lean, ( could be up, or downstream heated oxygen sensor ) " Downstream ", meaning after the catalytic converter.

PO174 = System too lean, ( bank 2 ) The fuel/air mix ratio is bad.

These DCT codes are generally caused by a problem with the emissions system. The following items are a few of the most common items to trigger those codes.

1. Dirty air filter. ( very common )
2. Faulty idle air control valve. ( common )
3. MAF, ( mass air flow ), sensor. ( very common )

All 3 of the above can prevent the onboard computer from determining the proper fuel/air mix ratio.
The oxygen sensors measure to insure the fuel/air mix produces maximum power with minimal emissions.

I hope this helps you.
Feel free to contact me in the comment section if you have a question.

Feb 15, 2011 | 2002 Ford F150 Regular Cab

1 Answer


sounds like EGR valve and sensor this controls idle speed when at a stop. the po171 is a burn lean or rich code need to know what bank 1 or 2. also check for a vacuum leak from one of the hoses.

Aug 07, 2010 | 1998 Ford Contour

3 Answers

What does computer code p1131 manufacturing control fuel air metering mean

Code p1131 manufacturer control fuel air metering, on a 2003 Ford Taurus. Where is part? Is there an easy way to see if it can be fixed without buying the expensive part?

Apr 27, 2009 | Ford Explorer Cars & Trucks

3 Answers

Where is the fuel pressure regulator located on an 2002 f150 v6?

in the center of the motor,in the rear on the fuel rail

Jan 16, 2009 | 2002 Ford F150 Regular Cab

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

2,055 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

74418 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22082 Answers


Level 3 Expert

5433 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides