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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 04-25-2011, 07:14 PM
blouster blouster is offline
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Location: Montreal
 
Join Date: Apr 2011
Posts: 9
Mein Auto: BMW 540I 1997
1997 540I ASC light stay on

Hey everybody ! I had a problem...When I was driving, sudently I had a lost of power and my ASC light was turning on and STAYED on without beeing able to turn it off !!!
The result of it was a lack of power and bad fuel economy...and random lost of idle and power !!! Very anoying !
The problem was easy to fix...new air mass flow sensor...the Bosch one !
Hope this can help,
Phil :-)
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  #2  
Old 04-25-2011, 07:59 PM
edjack edjack is offline
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Location: San Jose, CA
 
Join Date: May 2007
Posts: 9,091
Mein Auto: '97 540i 6 speed
Thanks for the feedback, most don't bother.

Strange that the ASC light came on.
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  #3  
Old 04-25-2011, 09:14 PM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
 
Join Date: Mar 2008
Posts: 21,106
Mein Auto: 02 BMW 525i M54 auto 130K
Quote:
Originally Posted by edjack View Post
strange that the asc light came on.
asc <===> maf

???
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  #4  
Old 04-26-2011, 07:08 AM
blouster blouster is offline
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Location: Montreal
 
Join Date: Apr 2011
Posts: 9
Mein Auto: BMW 540I 1997
I know...kind of strange...ASC<--->MAF ! I think the big change of power or idle was confusing the computer ! Not sure why the light was staying on !
I've been driving the car for two days...and never run so well, with lots of power and the ASC lights stays off !
So, it's something to look for if the ASC lights stay on !
Good day all,
Phil
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  #5  
Old 04-26-2011, 07:16 PM
Jimmys 530i Jimmys 530i is offline
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Location: Conyers, GA
 
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Mein Auto: 2003 530i
A bad MAF will throw a lot of codes, ranging from ABS to transmission. These cars never cease to amaze me on how so many parts are intertwined, and how a single failure will cause so many symptoms.
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