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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 06-27-2013, 08:23 PM   #1
03BIMMERM3
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Join Date: Feb 2013
Location: West Palm Beach
Posts: 149
My Ride: 2003 BMW M3
EML/BRAKE/DSC then limp mode

After replacing my MAF, I've been experience some very odd situations with my car. First, I just started getting a very rough idle on start-up, ranging from 2k rpm down to 700rpm...I'm pretty sure this is due to a vacuum leak somewhere, looking to fix this soon. Today, while driving on the highway, my EML, BRAKE, DSC lights came on simultaneously and the car went into limp mode. I pulled over on the side of the road, cut the car off and restarted and everything went back to normal. I do want to note that the SES light never came on. When I got back home, I used my peake reader and got the codes below:

1B 4F - Exhaust Gas temperature sensor (always see this one)
91 - Fuel control, Bank 2 (usually the car is running rich, might be related)
am running catless btw

69 - Engine coolant temperature, plausibility (new)
C3 - Control unit self-test, torque manager monitoring (new)


Could a vacuum leak be causing all these random events? Any ideas on what the problem might be from the codes? Thanks.

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Old 07-13-2013, 02:17 PM   #2
03E40sick
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Join Date: Feb 2009
Location: Metairie, La
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My Ride: 2003 bmw 325ci
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EML/BRAKE/DSC then limp mode

A vacuum leak would cause this for sure !!


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Old 07-14-2013, 03:44 PM   #3
etasport
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Join Date: Jul 2013
Location: Mechanicsburg, PA
Posts: 5
My Ride: 03 M3, 87 e30s50
EML indicates an issue with throttles or throttle actuator. Peak reader will not see those codes. Sounds like electrical tremor. Had the battery out lately? Check connections in the front and rear. Had this issue on a customer car once.
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Old 07-15-2013, 05:33 PM   #4
ROOFLESS
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Join Date: Feb 2006
Location: Toronto\Jupiter FL
Posts: 2,158
My Ride: has a 3.2L bag now
make sure ur brake fluid is not low...
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Old 08-05-2013, 03:06 AM   #5
reddroptop
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Join Date: Jun 2009
Location: New Mexico
Posts: 5
My Ride: 2001 BMW ///M3
I had the same problem when i got my M. It kept happening and after a quick restart, the problem would go away. I dug deeper into this problem and it turned out to be the front potentiometer for the throttle-boddies. The one you disconnect to change out your oil filter. Its an expensive part.. comming in around $90 for it but it fixed the same problem that I was having as you were.
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