P0171 won't go away

NC79 · 07-29-2008, 09:47 PM

Hi all,

I've had my check engine light go on and off for the last 3 or 4 months. I took it to the dealer once and they replaced a couple of hoses but said they weren't 100% sure it would fix it. I took it to an independent shop and they couldn't find anything wrong with it. I've made sure to tighten my gas cap at every fill up, cleared the codes many times using an OBD-II reader, but the P0171 (Bank 1 lean fuel condition) always comes back. It's the only code present. From searching on these forums, I'm guessing that it must be a bad MAF unit? Please advise.

Thanks,
Nick

A4Driver · 07-30-2008, 04:56 AM

Bronze · 07-30-2008, 06:14 AM

NC79 · 07-30-2008, 07:59 PM

Hmm, took a look but nothing seemed out of the ordinary. I don't really know what I'm looking for, though. Didn't see any obvious cracks or tears but I only looked around from above with the flashlight...

colm92116 · 04-08-2009, 07:00 PM

Did you ever get the P0171 problem resolved?

namjachoi · 04-10-2009, 03:22 PM

my mechanic cleared the code by cleaning out the oxygen sensor. car drove great after that except for the fact that now my oil pressure light is on but i think thats unrelated

Mumawalde · 04-19-2009, 08:56 AM

how do you clean out an oxygen sensor?

07-30-2008, 04:56 AM	#2
A4Driver Senior Member Garage is empty, add now Join Date: Mar 2000 Posts: 2,066	I had the same code. Was a crack in a vacuum hose. __________________ Now: 2009 Premium Plus, 2.0T, Quattro, Tip, Sport, Deep Sea Blue Pearl -------------------------------------------------------------------------------------- Then: 2002 3.0, Sport, Quattro, Manual, Denim Blue Pearl 1996 2.8 Quattro, Manual, Emerald Mica

07-30-2008, 06:14 AM	#3
Bronze Senior Member Garage is empty, add now Join Date: Aug 2003 Posts: 6,095	2nd. Look for tears in small hoses, especially at the clamps. __________________ Bronze 2002 A4 1.8T M/T quattro Brilliant Black/Ebony APR Stage 1, snub, TIP, 710N DV Neuspeed Short Shifter Koni FSD/Eibach/H-sport S4 sways B5 S4 front brakes, Porterfield R4S Stoptech SS lines Dunlop SP Sport 01/Yokohama AVID H4S

07-30-2008, 07:59 PM	#4
NC79 New Member Garage is empty, add now Join Date: Jul 2008 Posts: 2	Re: 2nd. Look for tears in small hoses, especially at the clamps. Hmm, took a look but nothing seemed out of the ordinary. I don't really know what I'm looking for, though. Didn't see any obvious cracks or tears but I only looked around from above with the flashlight...

04-19-2009, 08:56 AM	#7
Mumawalde Audiworld Junior Member 2001 Audi A4 Join Date: Nov 2008 Posts: 28	how do you clean out an oxygen sensor? how do you clean out an oxygen sensor?

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04-08-2009, 07:00 PM	#5
colm92116 New Member Garage is empty, add now Join Date: Nov 2005 Posts: 6	Did you ever get the P0171 problem resolved?

04-10-2009, 03:22 PM	#6
namjachoi Audiworld Junior Member Garage is empty, add now Join Date: Mar 2008 Posts: 51	my mechanic cleared the code by cleaning out the oxygen sensor. car drove great after that except for the fact that now my oil pressure light is on but i think thats unrelated

04-19-2009, 08:56 AM
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