E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   E46Fanatics > E46 BMW > General E46 Forum

General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

Thread Tools Search this Thread Rating: Thread Rating: 21 votes, 4.81 average. Display Modes
Old 10-31-2009, 10:29 AM   #1
Registered User
Join Date: Jul 2009
Location: Indiana, PA
Posts: 3
My Ride: 2003 325i
P0174 P0171 codes, system too lean bank 1, bank 2

I have an 03 325i. I am getting P0174 and P0171 codes. I took it to an independent shop, who erased the codes, and suggested that it may be an O2 sensor problem. Before I hit a 100 miles, the codes came back.

I've seen several theories as to why these codes happen, relating to the MAF sensor, or the intake/vacuum hoses. Is there an easy (hopefully inexpensive) definitive fix? The car runs fine except for the engine light keep coming back on.
hus23 is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 10-31-2009, 10:38 AM   #2
Registered User
Join Date: May 2007
Location: .
Posts: 6,608
My Ride: .
Send a message via AIM to 330ciandr6 Send a message via Yahoo to 330ciandr6
check your lower intake boot elbow. most common problem.

then check oil separator lines
Have a oil or coolant leak? Click here!:http://forum.e46fanatics.com/showthr...732&highlight=
ABS/DSC/Brake/Airbag light on?? Click here!:http://forum.e46fanatics.com/showthr...648&highlight=
330ciandr6 is offline   Reply With Quote
Old 10-31-2009, 11:05 AM   #3
Registered User
Join Date: May 2009
Location: Birmingham, AL
Posts: 230
My Ride: 2002 330ci
check your MAF, that was my problem.
Hinman is offline   Reply With Quote
Old 10-31-2009, 01:24 PM   #4
Registered User
Join Date: Feb 2006
Location: SoCal, US
Posts: 306
My Ride: 02 325i auto
I got those codes a while back and it turned out to be my fuel pump was failing and not enough fuel delivering to the engine. I tried to fix other things but finally pump died after two weeks and it was really the final culprit.
xe460 is offline   Reply With Quote
Old 10-31-2009, 01:27 PM   #5
Registered User
Join Date: Jul 2008
Location: Maryland
Posts: 13,042
My Ride: 135
Lol ironic I have the same code along with p0313. I'm gonna follow drew's advice and clean my MAF. Lemme know if you get it fixed and what it was.
BMW_Matt is offline   Reply With Quote
Old 11-03-2009, 03:38 PM   #6
Registered User
Join Date: Jul 2009
Location: Indiana, PA
Posts: 3
My Ride: 2003 325i

I took it down to my buddy's place, and after a lot of searching, we found a small pin hole in the intake boot. It took a while since there are a lot of ribs around it, but there was a slice with a small hole in the middle there. We put some silicon on it, and cleared the codes. So far they haven't come back.

Thanks everyone.
hus23 is offline   Reply With Quote
Old 01-26-2010, 06:36 PM   #7
Registered User
Join Date: Jul 2009
Location: Indiana, PA
Posts: 3
My Ride: 2003 325i
A quick update: After a few hundred miles, the codes come back. I ended up buying both intake tubes. Part #'s 13-54-1-435-627, and 13-54-705-209 ($35 total). Both of the old tubes had numerous cracks in them, and so far the codes haven't came back.
hus23 is offline   Reply With Quote
Old 01-04-2012, 04:08 PM   #8
Registered User
Join Date: Jan 2011
Location: Raleigh, NC
Posts: 22
My Ride: 2003 325i Sedan
+1 for hole in vac hose...just fixed mine.
ima_UNC_fan is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Censor is ON

All times are GMT -5. The time now is 02:23 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
(c) 1999 - 2016 performanceIX Inc - privacy policy - terms of use