Question about 1995 Ford Windstar

1 Answer

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

We are having problem with the Windstar. We are not able to run over 20miles per hour, and at 2100 RPM the idle keep going up but the car lossstrength it is like the transmission goes to neutral. The first testshowed codes PO402, PO732, PO733, PO171, and PO174 so I replacedDPFE/EGR Valve Presure Sensor, and Neutral Safety Switch I went to thegarage, and the mechanic told me that the transmission is fried so justto verify I bought the OBD II to run the diagnostic tests, now the testis showing codes PO340 (Camshaft Position Sensor A - Bank 1 CircuitMalfuntion) PO171 (System to Lean, Bank 1), and PO174 (System to Lean,Bank 2). I will be looking for leaks but in the mean time I would liketo know what are the symptoms of a bad Camshaft Position Sensor. Pleasereply to:

Posted by on

  • Andy7777 Jan 18, 2009

    How can be the fuel pressure when the idle keep going up, and I don't
    have any problem in 2nd, neither in 1st gear only in drive gear? I
    cleared the codes, and after a driving test re-checked and now none codes.

  • Andy7777 Jan 19, 2009

    I cleared the codes and recheck after a drive test, and no error codes this time. I still don't understant the relation between a fuel pressure problem with the idle (RPM) going up after 2100 RPM, and I don't have that problem in P. 2nd, 1st, neither neutral only in drive gear.


1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert that has over 500 points.


    An expert whose answer got voted for 20 times.

  • Expert
  • 195 Answers

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.

Posted on Jan 15, 2009

  • Rich Palmer Jan 18, 2009

    What you may be experiencing is once you go into drive the fuel pressure drops as the rpm drops off and the convertor in the transmission tries to lock up. As I said, if you have low fuel pressure or on the low side of the range you may not be getting the volume to properly operate the engine. Also check your fuel pressure regulator for a leak either of fuel or vacuum.

    Hope this helps.


    RPM Northwest


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

What are the probable causes of DTCs P0171 and P0174?

Please go to this site on pc, It will tell the meaning of the codes and detail info. God-Bless! ( Clink on first link, when page comes up.

Oct 28, 2015 | Cars & Trucks

1 Answer

Cen tech code reader problems 98568

All OBD Codes are on the internet with

You Type your codes & read up

Study OBD 2 Systems also


I had to Google Cen Tech as i never heard of it

They appear to be inexpensive low end for sure

You won't get a lot of data out it

If your never planning on going to professional software,
consider the top scan/code reader type tools like Innova Professional or at least mid level Actron & a couple other brands

You really need to see sensors,emission monitors, so
your ready for inspection

You will only get Generic Codes from a code reader
not body functions likes abs,air conditioning,srs,& others

More data is better-- you will learn these systems as time goes by

They have been with us for 35 years now

OBD1 15 years
OBD2 20 years

Aug 17, 2014 | 1999 Ford Ranger SuperCab

1 Answer

2001 lincoln ls. codes po171, po174, po340, p1131, s11

what engine? This vehicle had the 3.0 liter and the 3.9 liter available in the same year.

May 02, 2014 | Cars & Trucks

1 Answer


please go to : FOR MORE INFO, good-day!

Apr 17, 2014 | 2004 Cadillac SRX

1 Answer

1997 Ford F250 : OBD-II Trouble Code PO171 Need Possible Solutions

running lean. Clean MAF sensor with spray carb cleaner. The short heated wires inside the sensor. Remove MAF from big air intake tube.

Aug 19, 2011 | 2001 Ford Windstar

1 Answer

Hi I hve 2 codes PO171 PO174 on 1995 windstar what do i need to do

Those codes indicate your Windstar is running lean so you'll have to find out why. A couple of things to check are a restricted fuel filter or a vacuum leak.

Jun 06, 2011 | Ford Windstar Cars & Trucks

1 Answer

Codes po171 po174 and 1569 2000 windstar

Possible intake gaskets are leaking.There is a bulletin for the p0171 and p0174.These are engine running lean codes.Not sure on the 1569 code.

Dec 01, 2010 | 2000 Ford Windstar

3 Answers

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

Symptoms of a faulty Camshaft Position Sensor can include hard starting (or no starting), rough running/misfiring and/or loss of power.

Code 340 COULD be caused solely by a faulty Camshaft Position Sensor. However, this code refers to the entire circuit. So, replacing the sensor may not fix the issue. The problem could lie in any part of the circuit - the sensor itself, the wiring, or the PCM.

Codes 171 and 174 typically appear together. They are caused by the 02 sensors reading too much air (lean) in the exhaust. In most cases, simply cleaning the MAF sensor does the trick. I typically take it off and spray it with electronics or brake cleaner. Just make sure it dries before reinstalling. If this doesn't eliminate the codes, inspect all vacuum and PCV hoses, check for a dirty fuel filter and ensure the furl pressure is within limits.

For clarification, the first trip to the shop your car showed codes 402, 732, 733, 171 and 174. After changing the DPFE/EGR, did ALL those codes go away and now only codes 340, 171 and 174 exist? Or do you have the second set of codes in addition to the first codes?

Jan 15, 2009 | 2001 Ford Windstar

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

783 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

74544 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