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  #1  
Old 01-03-2012, 06:29 AM
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Default Codes p0171 and p0174

I have change the gaskets on the plenum and fuel rail and checked for any vacuum leaks but still getting the codes. Any suggestions?
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  #2  
Old 01-03-2012, 06:43 AM
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Default Re: Codes p0171 and p0174

Have you looked at this? If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!
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  #3  
Old 01-03-2012, 06:46 AM
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Default Re: Codes p0171 and p0174

Yeah mine is a 99 so it doesnt have that. Sorry I didn't post that.
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  #4  
Old 01-03-2012, 06:47 AM
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Default Re: Codes p0171 and p0174

Sig helps too
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  #5  
Old 01-03-2012, 06:59 AM
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Default Re: Codes p0171 and p0174

Yeah been meaning to fill that out keep forgetting to do that

----------

There I did my sig. Thanks for the reminder
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  #6  
Old 01-03-2012, 07:11 AM
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Default Re: Codes p0171 and p0174

CHeck your Filler Neck.

Leaks in the filler neck throw miscellaneous codes like this also.

Usually the return LIne(small rubber return) is colapsed or restricted.

Quick check and cheap fix.
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  #7  
Old 01-03-2012, 07:23 AM
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Default Re: Codes p0171 and p0174

Ok I forgot to post that part I noticed when I filled up yesterday that it leaked out so I looked and the vent tube is rusted off. Have to fix that and see what happens thanks.
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  #8  
Old 01-03-2012, 12:04 PM
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Default Re: Codes p0171 and p0174

i just had po171 and po174 codes and it was both upstream o2 sensors. rockauto.com has bosch for about $33 ea. easy to change.
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1998 ranger extended cab, 2wd, 4.0 ohv, 5 speed, sony xploid 52 4 way watt radio, 2 pair of pioneer 240 watt speakers, Cobra 29 LX LCD CB radio pushing 100 watts, k&n air filter, 15 inch exploder wheels, dual exhaust with 4 inch stainless tips, 2 12 inch subs with a 1000 watt amp just for the hell of it!

new project: dirt track modified racing at the local saturday night track.
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  #9  
Old 01-03-2012, 03:44 PM
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Default Re: Codes p0171 and p0174

Fix the filler neck first before you do your sensors!

Also, unplug your truck for 10 mins to reset the Codes!
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2001 Ford Ranger 4X4
Edge Package
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  #10  
Old 01-03-2012, 03:47 PM
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Default Re: Codes p0171 and p0174

I plan to fix that first also I have a code scanner to reset them.
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  #11  
Old 01-04-2012, 11:30 AM
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Default Re: Codes p0171 and p0174

i spoke too soon. before i replaced my o2 sensors (weekend before christmas) my light came on about 3 times a week. it hasnt came on since till last night. so i will look into the filler neck. i fixed it when i first bought the truck 1 1/2 years ago. so it could be i missed something.

things to check also for these codes: mass air flow sensor, vacuum leaks, pcv valve/lines, leaks in the intake tube after MAF, actually a lot of things can throw these codes (thanks ford).
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1998 ranger extended cab, 2wd, 4.0 ohv, 5 speed, sony xploid 52 4 way watt radio, 2 pair of pioneer 240 watt speakers, Cobra 29 LX LCD CB radio pushing 100 watts, k&n air filter, 15 inch exploder wheels, dual exhaust with 4 inch stainless tips, 2 12 inch subs with a 1000 watt amp just for the hell of it!

new project: dirt track modified racing at the local saturday night track.
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  #12  
Old 01-08-2012, 01:56 PM
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Posts: 98
Default Re: Codes p0171 and p0174

well i changed the filler neck and it seems to have fixed the codes. the light has not come on at all today so we will see.
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