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7 Series - E38 (1995 - 2001)

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Old 08-08-2012, 09:41 AM
unvecchiomac unvecchiomac is offline
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Location: Texas
Join Date: Apr 2011
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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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Old 10-12-2012, 12:57 PM
Maddogg Maddogg is offline
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Location: Naples, FL
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Mein Auto: 2001 740IL
Yeah, say that 5 times fast.....
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Old 10-12-2012, 09:25 PM
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BMWFatherFigure BMWFatherFigure is offline
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Location: Perth, Western Australia
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Mein Auto: E23;E32;E34;E38;R50;R55
Maybe car speak for 'cats gone bad'?
Good - Fast - Cheap: Pick any two.
3 x E32 735iL (Alpine White, Glacier Blue & Kashmir Beige); 2 X E38 735iL (Oxford Green & Alpine White); E53 X5 4.4i (Pearl Beige); R50 Cooper; R55 Cooper Clubman (Both Pure Silver).
E38 Parts Car
E21 318i; E23 735i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
I've just changed my wiper blades and now my reverse lights don't work. Should I change my fuel pump relay?
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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: 1,271
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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