Home Forums Articles How To's FAQ Register
Go Back   Xoutpost.com > BMW SAV Forums > X5 (E53) Forum
Fluid Motor Union
User Name
Password
Member List Premier Membership Search Today's Posts Mark Forums Read

Xoutpost server transfer and maintenance is occurring....
Xoutpost is currently undergoing a planned server migration.... stay tuned for new developments.... sincerely, the management


Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 09-28-2016, 03:43 PM
Member
 
Join Date: Aug 2016
Location: SF Bay Area
Posts: 13
caposto is on a distinguished road
Unhappy 3.0 P0172 and P0175 codes

I bought my 2002 X5 3.0 a year and a half ago. I was getting these two codes every now and then but now its more regular and I've got a smog coming up. They are "Bank 1 too rich" and "Bank 2 too rich." The only thing I could find was it could be a dirty AFM so I cleaned it and the contacts but no change. There also seems to be no rhyme or reason to when the codes are tripped (hot, cold, accelerating, idling, etc.) P0172 trips first and then shortly after I get P0175.

The service is up to date on it so was hoping you all could point me to possible causes. Any help would be much appreciated. Thanks!
Reply With Quote

Sponsored Links

  #2  
Old 09-28-2016, 04:33 PM
Member
 
Join Date: Aug 2016
Location: SF Bay Area
Posts: 13
caposto is on a distinguished road
After a little more searching just now, I seem to have found a thread with the problem solved here: http://www.xoutpost.com/bmw-sav-foru...0175-dtcs.html

I can only assume the intake boot leak is causing a lean condition and the ECU is over-compensating with fuel, as the cracks let un-metered air through, and then those cracks 'seal' up a little as the engine vibrates and moves and the ECU can't adjust back quite quick enough. Just a theory, but I will be checking my intake boot and other hoses right away!
Reply With Quote
  #3  
Old 09-28-2016, 09:21 PM
Joshdub's Avatar
Member
 
Join Date: Jul 2014
Location: Seattle
Posts: 2,065
Joshdub is on a distinguished road
I had the same thing recently. Chances are the codes are wrong and it's a really running lean. You probably have a vacuum leak. Just start replacing old hoses.
__________________
03 3.0i mt
89 325is
Reply With Quote
  #4  
Old 09-28-2016, 11:46 PM
Premier Member
 
Join Date: Jun 2015
Location: Southlake, Texas
Posts: 2,093
X53Jay4.8is is on a distinguished road
Quote:
Originally Posted by caposto View Post
After a little more searching just now, I seem to have found a thread with the problem solved here: http://www.xoutpost.com/bmw-sav-foru...0175-dtcs.html

I can only assume the intake boot leak is causing a lean condition and the ECU is over-compensating with fuel, as the cracks let un-metered air through, and then those cracks 'seal' up a little as the engine vibrates and moves and the ECU can't adjust back quite quick enough. Just a theory, but I will be checking my intake boot and other hoses right away!
Have the engine smoke to determine where the leak is that causing the lean code.
Reply With Quote
  #5  
Old 09-29-2016, 01:21 AM
Member
 
Join Date: Aug 2016
Location: SF Bay Area
Posts: 13
caposto is on a distinguished road
Thanks for your thoughts. I will investigate further now that I have some direction on what to look for and post my findings and outcomes in hopes of helping others.
Reply With Quote
  #6  
Old 09-29-2016, 07:41 AM
upallnight's Avatar
Member
 
Join Date: Aug 2012
Location: Cook County
Posts: 6,390
upallnight is on a distinguished road
Why is it that when people post their trouble codes on this forum, other people will tell them that they are misinterpreting the code.

P0172 and P0175 are both Rich Codes. A rich condition is when you have too much gas in the mixture or too little air in the mixture.

Too much gas could be due to the fuel pump pressure is too high. You can verify this with a fuel pressure gauge at the rail. It can also be due to a leaky injector(s). You can also verify this at the fuel rail with a fuel pressure gauge.

Too little air could be due to a dirty air filter, bad maf or a bad iac valve. When did you last replace the air filter? If you have a scanner that can provide real time data, what is the airflow rate that the MAF is sending to the DME (G/S). When did you last check, service the IAC valve?

Fuel trim data will verify if you have a rich or lean condition. If the trim data is negative that mean the engine is running rich. Freeze frame data will tell you as to what the engine was doing when the code(s) was set. Is the engine thermostat open so that the engine doesn't warm up so the DME is adding fuel to a cold engine.

Only right way to work on these computer controlled engines is with a scanner that allows you to view real time data.
__________________
2006 Infiniti G35
2001 BMW 3.0I E53 X5 Build date 08/2000
Lotus Europa 1970 Destroyed by fire
Lotus Europa 1970 S2 Renault Powered
Lotus Type 52 1970 Twincam Webers Powered
PORSCHE 911 Targa 1982 The Garage Queen
Audi Avant donated to Kars for Kids
BMW 525IT Sold
Audi 4000CS Quattro Sold
Jensen Healey Lotus Powered Sold
Opel 1900 Sold
Triumph Spitfire 1971 Sold
Triumph Spitfire 1968 Sold
Plymouth "Cuda" 340 Six pack SOLD
Reply With Quote
  #7  
Old 09-29-2016, 09:19 AM
crystalworks's Avatar
Premier Member
 
Join Date: Jun 2014
Location: SA, TX
Posts: 3,799
crystalworks is on a distinguished road
^I was thinking fuel system as well. Injector(s), regulator, etc. Not reaching operating temp would also cause a rich condition as upallnight mentioned.

Though, the M54 is widely known to suffer from vacuum leaks as well, just like all the BMW straight 6's. I would guess it would need to be a largish leak to cause the ECM to compensate enough to throw a rich code. Usually vacuum leaks are misfire and lean codes.

Also a good idea to see if you can get live data from the X. Will help your diagnosis. I think he's said he uses Torque, which I have used in the past as well. You need to see what the fuel trims are doing as he mentioned.
__________________
2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)


2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)

Last edited by crystalworks; 09-29-2016 at 09:28 AM.
Reply With Quote
  #8  
Old 09-29-2016, 09:47 AM
upallnight's Avatar
Member
 
Join Date: Aug 2012
Location: Cook County
Posts: 6,390
upallnight is on a distinguished road
Quote:
Originally Posted by crystalworks View Post
^I was thinking fuel system as well. Injector(s), regulator, etc. Not reaching operating temp would also cause a rich condition as upallnight mentioned.

Though, the M54 is widely known to suffer from vacuum leaks as well, just like all the BMW straight 6's. I would guess it would need to be a largish leak to cause the ECM to compensate enough to throw a rich code. Usually vacuum leaks are misfire and lean codes.

Also a good idea to see if you can get live data from the X. Will help your diagnosis. I think he's said he uses Torque, which I have used in the past as well. You need to see what the fuel trims are doing as he mentioned.
Torque Pro, I believe in giving back to the people that devote their time and effort to develop an App. My philosophy is that if you like the App you should buy the App.
__________________
2006 Infiniti G35
2001 BMW 3.0I E53 X5 Build date 08/2000
Lotus Europa 1970 Destroyed by fire
Lotus Europa 1970 S2 Renault Powered
Lotus Type 52 1970 Twincam Webers Powered
PORSCHE 911 Targa 1982 The Garage Queen
Audi Avant donated to Kars for Kids
BMW 525IT Sold
Audi 4000CS Quattro Sold
Jensen Healey Lotus Powered Sold
Opel 1900 Sold
Triumph Spitfire 1971 Sold
Triumph Spitfire 1968 Sold
Plymouth "Cuda" 340 Six pack SOLD
Reply With Quote
  #9  
Old 09-29-2016, 09:59 AM
crystalworks's Avatar
Premier Member
 
Join Date: Jun 2014
Location: SA, TX
Posts: 3,799
crystalworks is on a distinguished road
Quote:
Originally Posted by upallnight View Post
Torque Pro, I believe in giving back to the people that devote their time and effort to develop an App. My philosophy is that if you like the App you should buy the App.
Agreed. It's not an expensive app if memory serves. <$50
__________________
2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)


2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)
Reply With Quote
  #10  
Old 09-29-2016, 10:07 AM
upallnight's Avatar
Member
 
Join Date: Aug 2012
Location: Cook County
Posts: 6,390
upallnight is on a distinguished road
Quote:
Originally Posted by crystalworks View Post
Agreed. It's not an expensive app if memory serves. <$50
When I bought the app it was $4.99.
__________________
2006 Infiniti G35
2001 BMW 3.0I E53 X5 Build date 08/2000
Lotus Europa 1970 Destroyed by fire
Lotus Europa 1970 S2 Renault Powered
Lotus Type 52 1970 Twincam Webers Powered
PORSCHE 911 Targa 1982 The Garage Queen
Audi Avant donated to Kars for Kids
BMW 525IT Sold
Audi 4000CS Quattro Sold
Jensen Healey Lotus Powered Sold
Opel 1900 Sold
Triumph Spitfire 1971 Sold
Triumph Spitfire 1968 Sold
Plymouth "Cuda" 340 Six pack SOLD
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On





All times are GMT -4. The time now is 11:40 AM.
vBulletin, Copyright 2019, Jelsoft Enterprises Ltd. SEO by vBSEO 3.6.0
2017 Xoutpost.com. All rights reserved. Xoutpost.com is a private enthusiast site not associated with BMW AG.
The BMW name, marks, M stripe logo, and Roundel logo as well as X3, X5 and X6 designations used in the pages of this Web Site are the property of BMW AG.
This web site is not sponsored or affiliated in any way with BMW AG or any of its subsidiaries.