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7 Series - E38 (1995 - 2001)

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  #1  
Old 08-08-2012, 09:41 AM
unvecchiomac unvecchiomac is offline
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Location: Texas
 
Join Date: Apr 2011
Posts: 4
Mein Auto: 325I
01 740i - multiplicative catalyst limit reached?

2001 740I, 142000 miles on the speedo. check engine light came on, scanned codes and found "multiplicative catalyst mixture adaptation control limit reached" plus MPG was down so replaced front sensors. car ran great and smoother but now a week later check engine light is back on with same codes. looked at the data stream and all sensors are responding as good sensors with voltage sweeping from .2 to .9 volts. any ideas?
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  #2  
Old 10-12-2012, 12:57 PM
Maddogg Maddogg is offline
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Location: Naples, FL
 
Join Date: Jul 2010
Posts: 5
Mein Auto: 2001 740IL
Yeah, say that 5 times fast.....
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  #3  
Old 10-12-2012, 09:25 PM
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BMWFatherFigure BMWFatherFigure is offline
Old School
Location: Perth, Western Australia
 
Join Date: Aug 2012
Posts: 2,289
Mein Auto: E23;E30;E38;E32;E34 +
Maybe car speak for 'cats gone bad'?
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E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
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  #4  
Old 10-13-2012, 07:28 AM
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joyism5 joyism5 is offline
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Location: USA
 
Join Date: Jan 2011
Posts: 1,270
Mein Auto: '99 740IL, K75RT
Have you scanned the car using INPA? If yes, could you post the freeze screen's, I would like to compare with mine. Is this the only code? What is the 4 digit format? You might have a vacuum leak, and the DME cannot compensate anymore with gas, in order to have a good mixture for the cat converters. For instance I am fighting a vacuum leak and I have a code for the vacuum leak and also INPA is giving me the mult. catalyst reached.
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