Question about 1999 Ford Windstar

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1999 ford windstar 3.8 eng miss

Scanned fore codes has a po171& po174& po302..code po171 is bnk 1 lean..po174 is bnk 2 lean..po302 is cyl 2 misfire...changed plugs cleared codes test drive. re set same codes..noticed misfire accures from1350 rpm-1650 rpm. does not mss befor or after.i believe ther may be tsb on this issue.. any ideas..

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  • Bruce Thomas Mar 18, 2009

    OK. I havea 200 Winstar, had an engine light come on , I borrowed a code reader from a freind. Within 10 seconds the code came up saying PO-174. I looked in the book and found the code . It statted (engine lean right bank).



    I looked into this problem on this site and found some advice 99% of the time it's a vacumn hose problem. Check the hoses to the PCV valves.

    Sure enough it was a vacumn line / hose off on the back side of the air intake cowling. Plugged it back on . Reset the code . Problem gone.



    Check the vacumn lines first before you go to an expensive shop.



    The kid at the local quick change oil shop in my town changed out the cannister air filter on my last visit. Most likely the line came off at that time. CHEERS goodluck

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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

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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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05 navigator codes po012 intake " A " camshaft position over ******** bank 1 po302 random misfire po302 cyl. 2 misfire po303 cly. 3 misfire po304 cyl. 4 misfire po2195 o2 stuck lean bank 1 sensor 1 po2196...


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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

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

2 Answers

Help on finding out wind star coads PP0171-/-P074-/-P0401


first PO171 o2 bank 1 s1 lean PO174 o2 bank2 lean
PO401 cyl 1 misfire
when an engine misfires the oxygen sensor will read the oxygen from that cyl sensor doesnt read fuel so every misfire is a air pump to diagnose we have to fix misfire first check the coil wires and plugs for cyl 1 use spray bottle with water run engine hot at idle spray wires with water if enging runs rough shakes or stalls then replace the wires dont spray with to much water if the wires are real bad you may not be able to restart engine

try this first once fix misfire clear codes and drive it

plz comment vote reply if you need more help

Jan 17, 2011 | Ford Windstar Cars & Trucks

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

3 Answers

2003 Ford Ranger 4x4 extended cab- diagnostics checked and got these codes- P0171, P0174, P0300, P0316. Can you tell me what they mean?


P0171------ system too lean bank#1
Po174------ system too lean bank#2
For these 2 codes, try cleaning the maf sensor (mass air flow), that is mounted in the big black hose that goes from the air filter housing to the throttle plate, if it is dirty, that will cause those 02 sensors to send a signal to the computor to lean the air fuel mixture. If cleaning it doesn't work, the sensors will probably need changing.
P0300---- Random/multiple cylinder misfire
P0316---- Cylinder misfire at start up---- first 100 revolutions.
On those 2 codes, you have to do some testing to find out why there is a misfire.
Possible causes:
dirty/malfunctioning injectors
weak coil pack
fowling spark plugs/wires
Low fuel pressure

May 11, 2010 | 2003 Ford Ranger Regular Cab

2 Answers

Why is my 1997 expedition showing a misfire on number 2 cylinder OBD code PO302. Also I am getting code readings PO174 andPO171 system to lean on Bank 1and 2


PO302 is being a misfire, could mean the plug is bad or the coil is bad for that cylinder. Which can give you the misfire reading and the system to lean codes. Check the #2 coil for firing.

Jan 28, 2010 | 1997 Ford Expedition

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

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