Check Engine Light. - BMW Forum -
BMW Forum BMW Forum

Auto Insurance

» Featured Product
Wheel & Tire Center

Go Back   BMW Forum - > BMW Model Specific Forums > 1,6,7,8 - Series and Mini Cooper
Register Home Forum Active Topics Gallery / Showroom Auto Loans Garage Search Today's Posts Mark Forums Read Auto EscrowInsurance

1,6,7,8 - Series and Mini Cooper General Chat related to models that do not fit into particular categories above. Please try to put your discussion in more appropriate sections. This section does cover the 1 Series, MINI Cooper and 8-Series vehicles: BMW 830i, BMW 840Ci, BMW 850i, BMW 850Ci, BMW 850CSi, M8, Alpina B12, BMW CS Concept and others. is the premier BMW Forum on the internet. Registered Users do not see the above ads.
LinkBack Thread Tools Display Modes
Old 09-11-2005, 12:40 PM   #1 (permalink)
Join Date: Feb 2004
Posts: 3
car34 is an unknown quantity at this point
Check Engine Light.

2000 740il. The check engine light comes on. With the scanner I have it says it is Genaric Code 171 System to lean on bank 1. I did replace both of the Ox sensors before the cats. Going to change the rears next week. After thinking about I guess I should have replace the two on bank 1 Frist. Has any one else had this same problem? What else would cause just one side to be lean? No Vacum Leaks that I can Find.

Last edited by car34; 09-11-2005 at 02:43 PM.
car34 is offline   Reply With Quote
Sponsored Links
Old 09-24-2005, 03:31 AM   #2 (permalink)
1st Gear Member
Join Date: Mar 2005
Location: indianapolis, Indiana
Posts: 280
bryan1970 is an unknown quantity at this point
while it could be faulty O2 sensors sometimes the intake manifold gaskets can leak a very small amount and casue the fault. and be hard to detect aswell. how many miles are on the car? another thing that can casue a lean mixture and is also common on the V8's is the backing plate on the intake manifold. it is kinda like a sophisticated PCV valve. however they are usually quite noticable if they fail. for one there should be lean faults for both banks, the engine will smoke blue smoke( oil being burned), and most of the time thay make noises. i have herd of the noises being described as a sound similar to a turkey
bryan1970 is offline   Reply With Quote
Sponsored Links

  BMW Forum - > BMW Model Specific Forums > 1,6,7,8 - Series and Mini Cooper

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Check Engine Light aheath 3-Series (E36) 1 04-27-2005 06:27 PM
Check Engine Light On, But Only When I Start Car BMW-ATI 3-Series (E36) 5 04-15-2005 09:40 PM
Check Engine Light & Air Bar Light blackstallion 3-Series (E36) 1 11-11-2004 11:53 AM
Red check engine light came on today YNGRVP 3-Series (E36) 9 05-28-2004 09:36 PM
Check Engine Light came on today camnipotent 3-Series (E36) 22 05-17-2004 06:23 PM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -5. The time now is 08:03 AM.

Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.3.2
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.