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7 Series - E38 (1995 - 2001)

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  #1  
Old 08-09-2012, 06:29 AM
unvecchiomac unvecchiomac is offline
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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?
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  #2  
Old 08-09-2012, 05:16 PM
D90 D90 is offline
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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
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Old 08-10-2012, 05:11 AM
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BMWFatherFigure BMWFatherFigure is offline
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Location: Perth, Western Australia
 
Join Date: Aug 2012
Posts: 2,338
Mein Auto: E23;E30;E38;E32;E34 +
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.
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