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Audi A4 The Audi A4 model offers nimble handling and performance that makes it one of the leading cars in its class. Read more about the Audi A4 in the Audi A4 review.

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  #1  
Old 01-24-2006, 08:50 PM
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Default Help fault code # p0171

Help me please My check engine light turned on today and i had the code ran at auto zone, and it came back with code p0171 (the fuel system for bank one was to lean) the employees there had no clue what that meant. so i went to checker auto and they ran the same code but it came back with fuel system to lean due to the MAF sensor what does this mean , how can i fix it, is it expensive......any help is greatly appreciated.....any one else have this problem with their audi, by the way i have a 2002 a4 Q auto. thank you all in advance..
  #2  
Old 01-24-2006, 08:53 PM
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Default RE: Help fault code # p0171

umm i think ur maf is gunna die soon, they are 87 bucks from audi well for a 2001 that is. i think im on my 6th or 7th maf, easy to replace tho
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  #3  
Old 01-24-2006, 08:56 PM
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Default RE: Help fault code # p0171

are they always going out? is there any way to maintenance them? by the way where are they or it?
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Old 01-24-2006, 09:01 PM
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Default RE: Help fault code # p0171

o mine are going out for a different reason then urs. there maybe a little bit of oil on the sensor. o ya MAF=Mass Air Flow sensor, it is located in the airbox there are wires going to the top of the airbox that then lead to the maf
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Yeah you are a boost *****.
  #5  
Old 01-24-2006, 09:04 PM
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Default RE: Help fault code # p0171

so can you just clean them, if my sensor has oil on it?
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Old 01-24-2006, 09:05 PM
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Default RE: Help fault code # p0171


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ORIGINAL: cireecnop1

are they always going out? is there any way to maintenance them? by the way where are they or it?

No they aren't always going out. It's not abnormal for it to go out at 70k miles or so. You can try spraying the MAF element with a electronics tuner cleaner. I doubt it will do a whole lot though.
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  #7  
Old 01-24-2006, 09:05 PM
 
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Default RE: Help fault code # p0171

you could just clean them up.
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Old 01-24-2006, 09:06 PM
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Default RE: Help fault code # p0171

first i would disconnect ur negative conection to teh battery for 5 min or so and then reconnect it and see if the cel goes away.
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Originally Posted by auditech79 View Post
Yeah you are a boost *****.
  #9  
Old 01-24-2006, 09:07 PM
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Default RE: Help fault code # p0171

wow that is perfect timing..jestnomen..my car has 69890 miles on it....when i take it apart will i be able to tell what exactly i need to spray with that cleaner?
  #10  
Old 01-24-2006, 09:09 PM
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Default RE: Help fault code # p0171

jeff..they erased the code, the light shut off for like one mile then it came back on. does that mean it for sure needs to be replaced
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Old 01-24-2006, 09:11 PM
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Default RE: Help fault code # p0171

ya if it came back on that means that it keeps sensing that u are running lean, so u should try to clean it and if that dosent work then u need to buy a new one
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Originally Posted by auditech79 View Post
Yeah you are a boost *****.
  #12  
Old 01-24-2006, 09:16 PM
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Default RE: Help fault code # p0171

thank you guys, for helping me out with this. i am gonna go out and try it right now.
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Old 01-24-2006, 09:18 PM
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Default RE: Help fault code # p0171

good luck with it all and tell us how it all works out
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CLX- it's better to have it and not need it, than need it and not have it. Preparedness is not paranoia.
My art is different from yours; it consists not in defeating others, but in not being defeated.
Quote:
Originally Posted by auditech79 View Post
Yeah you are a boost *****.
  #14  
Old 01-24-2006, 09:18 PM
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Default RE: Help fault code # p0171


Quote:
ORIGINAL: cireecnop1

wow that is perfect timing..jestnomen..my car has 69890 miles on it....when i take it apart will i be able to tell what exactly i need to spray with that cleaner?
Yes, there is a little tiny thread of wire in the hole at the end of the sensor. Spray that. It's likely you'll just need to suck it up and buy a new sensor though. Audi began making some remanufactured ones that are pretty cheap though. ECS Tuning sells them I think.
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  #15  
Old 01-24-2006, 09:51 PM
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Default RE: Help fault code # p0171



Where was this ???

Anyone that cant tell you what it means is a total moron and i would never take my car to them!!!!
2nd it has nothing to do with the MAF !!!!!

99.9% of the time a lean condition will be cause at Idle because of a vacum leak in the intake tract !!!!
so start checking hoses out under the hood, mainly the FPR hose and all the small ones that are prone to ruptuting and heat rotting.

I've been a drivability and diagnostics technician for nearly 9 years and that where it ususaly ends up.
Also you would be surprised what a bad ground can cause !!!
i seen from fueling issues wit multiple codes to complete failure of components!

Good luck on your hunt.
  #16  
Old 01-24-2006, 09:51 PM
 
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Default RE: Help fault code # p0171

i always go that code when i had a k04 kit wasnt my maf though. usually came up when i over boosted. alot of diff things can be wrong for that code to appear just to let u know. before u start spendin money y not get it vaged
  #17  
Old 01-24-2006, 10:19 PM
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Default RE: Help fault code # p0171

thats the code i would get, then i would replace it and it would go away
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CLX- it's better to have it and not need it, than need it and not have it. Preparedness is not paranoia.
My art is different from yours; it consists not in defeating others, but in not being defeated.
Quote:
Originally Posted by auditech79 View Post
Yeah you are a boost *****.
  #18  
Old 01-25-2006, 12:17 AM
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Default RE: Help fault code # p0171


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ORIGINAL: goldenchild

i always go that code when i had a k04 kit wasnt my maf though. usually came up when i over boosted. alot of diff things can be wrong for that code to appear just to let u know. before u start spendin money y not get it vaged
umm yeah most likely you were leaning out on the stock injectors or fuel preessure was inadeqate and the engine wasnt getting enough fuel
  #19  
Old 01-25-2006, 04:29 AM
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Default RE: Help fault code # p0171

Sorry it took forever to write back on here... but the damn car died... when i went outside to go start it, it took forever to start it would just crank and crank and crank then start.....then i drove to the other side of town shut it off then when to start it again and this time it wouldn't start at all just crank. could this still all be caused by possibly the MAF sensor or something worse? im not sure what to do just pay the deductible on the warranty i guess.
  #20  
Old 01-25-2006, 04:31 AM
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Default RE: Help fault code # p0171

yes it could be the maf but i would take it to audi cus it sounds like its only getting worse
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CLX- it's better to have it and not need it, than need it and not have it. Preparedness is not paranoia.
My art is different from yours; it consists not in defeating others, but in not being defeated.
Quote:
Originally Posted by auditech79 View Post
Yeah you are a boost *****.
Old 01-25-2006, 04:31 AM
 
 
 
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