Question about 2004 Ford F150

1 Answer

Codes #171 & 174

Have A 2004 Ford F150 Heritige 4.2 2wheel drive,auto, Check engine light is on ,showing code 171 &174 con you fix this problem.

Posted by on

  • 2 more comments 
  • Anonymous Jan 08, 2009

    had code 174 & 171: replaced vacuum hose from valve cover to pcv, cleaned injectors and installed new fuel filter. service engine light comes back on and code is now 174 only. when i re-set the light before a long trip (300 miles+) the light stays off (this happened twice) but as soon as i start driving around town it comes back on within 15-20 miles. mileage has dropped from nearly 20mpg to 17.5 on trips and it has gotten worse around town. any suggestions as to what to do next?

  • Anonymous Feb 05, 2009

    I have a 2003 Ford F150 with a 4.2 liter that has troble code 171 and 174. I was told to replace the Mass Air Flow sensor which I did but it did not correct the problem . I was also told it could be a bad O2 sensor but there are 4 of them and I have no I idea which one might be bad. I was also told to check the vacuum hose to PCV but have no idea where it is located.

    Can someone help me?

  • ramendoza19 Mar 29, 2009

    I have a 2003 4.2l v6 f150 and I originally had codes p171&p174 so I took my truck to city garage and spent $110.00 on a new maf did not fix the problem so I replaced the ruel filter, cleaned the injectors, replaced all 4 o2 sensors. So now I am going to replace the EGR valve hoping thats what the problem is I will let you know.

  • Anonymous Mar 15, 2014

    Ford says cats are going bad?

×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Sergeant:

    An expert that hasĀ over 500 points.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 199 Answers

first check out for o2 sensor if its faulty this can show up.but if its proper.Evaporative emission control system leak very small 171 System too lean (bank 1) 174 System too lean (bank 2) 

Posted on Jan 05, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

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

Hi,
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.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Tried getting ford f150 4.2 2003 inspected. Replaced air filter and fuel filter already. Check engine lit was on before replacing them . Now check engine light is out . But won't pass inspection.


As for your codes p1131 and 1151: Ford - Lack Of Heated Oxygen Sensor Bank 1 Sensor 1 Switches - Sensor Indicates Lean


Last week I had the very same catalyst, evap and ECG codes come up on my 1999 Mercury Mystique which is like a Ford Taurus. A friend was able to find a hole or leak in the hose connected, replaced it and it runs fine. I havent run it a full and straight 50 miles yet to clear the check engine light but that repair alone changed the entire way the car was poorly driving. Im sure that hasnt fixed all the probs but thats a good starting point.

Mar 04, 2013 | 2003 Ford F150 Regular Cab

3 Answers

The truck start shaking & show me a light that said check engine soon


When "check engine" turn on, one or more fault codes are stored in the PCM; I suggest scanned the PCM (computer) to know exactly what fault codes there. With this code numbers go back and could send you additional details.

Keep in touch.

Feb 10, 2011 | 2004 Ford F150

1 Answer

Hello,i'm Robert;my question is 1.My truck Eng. light is on and i can't get an inspection untill i find out what is going on,the truck Idle's when it warm's up high then low but run's very well an analysis...


what was the code for the check engine light the code lets u know what sensor or component is giving u a problem ----have vehicle scanned most auto stores such as advanced auto do this service for free get the code the trouble code will help locate ur problem so u can fix it

May 06, 2010 | 1997 Ford F150 Regular Cab

4 Answers

How do i turn off my check engine light on my f150 '02


It will have to be done with a code reader for obd2 system.

Apr 28, 2010 | 2002 Ford F150 Regular Cab

1 Answer

2001 ford f150 w/4.2 v6 run rough under load or acceleration service engine light is on. idles fine


Have the check engine light codes checked.This will tell you what to look for and what could be causing the problem.Auto Zone will check codes for free.There are other part stores that will do this for free.Let me know what codes you get and I`ll be glad to help.Good luck.

Mar 25, 2010 | 2001 Ford F150 Styleside SuperCrew

3 Answers

How can I read the 2002 ford f150 obd codes. My service engine soon light is on. Do I have to purchase a reader. My wife's will show what codes are popping the light if you turn the key...


Bring it to Auto Zone they usually will hook up their code reader to help you out, and you can google trouble codes 2002 f150 OBD II codes.

Jul 14, 2009 | 2002 Ford F150 Regular Cab

1 Answer

Ford F150 2 wheel drive with ABS Light on. How do


Some auto parts stores will read the codes for free, such as AutoZone. Without the code, it's hard to guess. For example, it could be any of the four wheel sensors.

Jun 04, 2009 | 1999 Ford F150 Regular Cab

2 Answers

1994 F150 Ford


could be a tps sensor or map sensor. have truck scanned for exact codes

Oct 07, 2008 | 1994 Ford F150 Styleside Supercab

Not finding what you are looking for?
2004 Ford F150 Logo

2,186 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts

yadayada
yadayada

Level 3 Expert

74115 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22082 Answers

fordexpert

Level 3 Expert

5414 Answers

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

Answer questions

Manuals & User Guides

Loading...