99 740i - Check engine light - Bimmerfest - BMW Forums

Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Please follow the links below to help get you started!

Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series & 8 Series > 7 Series - E38 (1995 - 2001)

7 Series - E38 (1995 - 2001)

Thread Tools Display Modes
Old 08-09-2012, 06:29 AM
unvecchiomac unvecchiomac is offline
Registered User
Location: Texas
Join Date: Apr 2011
Posts: 4
Mein Auto: 325I
Question 99 740i - Check engine light

1999 740i 142000miles, check engine light came, pulled code “multiplicative catalyst mixture adaptation control limit reached”. Replaced both front oxygen sensors and code came back, any ideas?
Reply With Quote
Old 08-09-2012, 05:16 PM
D90 D90 is offline
Registered User
Location: USA
Join Date: Aug 2012
Posts: 1
Mein Auto: 750iL
My 2001 750iL also had check engine light yesterday, code reader say P0171 System too lean. Brought it to a indy shop, and the guy there suggested me to clear the code first then drive for a couple days to see if the code comes back. Do you know if that is a good idea? As I understand, if the car really has problem, it might hurt the emission system pretty bad if I keep it running. So can anyone give me some suggestions? Thx
Reply With Quote
Old 08-10-2012, 05:11 AM
BMWFatherFigure's Avatar
BMWFatherFigure BMWFatherFigure is offline
Old School
Location: Perth, Western Australia
Join Date: Aug 2012
Posts: 4,106
Mein Auto: E23;E32;E34;E38;R50;R55
If you have access to a exhaust gas analyzer check mixture strength. Rich costs extra gas; Lean costs valves (those ones in the head). An injector clean may be the way to go. Bad spray patterns etc will upset the O2 sensors.
Reply With Quote

See More Related BMW Stories

Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series & 8 Series > 7 Series - E38 (1995 - 2001)
Today's Posts Search
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

Forum Jump

All times are GMT -7. The time now is 10:59 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
© 2001-2015 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms