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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 10-27-2008, 12:06 PM   #1
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Join Date: Jul 2005
Location: Atl. Georgia
Posts: 22
My Ride: LSB M3
Need help with DME???

This is the situation. I have a 2001 m3. i have went from o2 replacement to after market cats and exhaust to dme. The guy who extended the o2 sensors to the post cats used electrical tape after splicing them and stated that he couldnt do anything else about the engine light still being on. i get the car back driving no more than 50mph to the house. Another guy looks at it from another dealership noticed that the tape that was used for extension was burned out to the point of frying the dme. He tells me the o2 sensors have to be replaced along with the dme.If the Dme was burned or fried to the point that it has to be replaced, the car wouldnt be able to crank or drive or do anything else should it? Is this a gimmick or is this what it is? The computer is showing code 81 which indicates a protection fault that prevents any extra fuel going into the cylinders which prevents any more torque or acceleration. This is why i cant go past 5000rpm. What can i do to get this fixed?? Do i really need a dme??

Last edited by rlauren15; 10-27-2008 at 03:44 PM. Reason: State everything in a quesion
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Old 10-27-2008, 01:58 PM   #2
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Join Date: Jul 2005
Location: Atl. Georgia
Posts: 22
My Ride: LSB M3
Can anyone reply to this? What should one do??
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Old 11-17-2008, 09:37 PM   #3
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Join Date: Oct 2003
Location: fLoRida
Posts: 157
My Ride: 2006 E46 M3 ZCP
Check your O2 pre-cats & post cats connections, sometimes they mis-plug the oxygen sensor with the post/pre cats. Reset the codes & if car does not run correctly, disconect the post O2 but keep the pre-cats O2 at all time.

Do a DME diagnostic. If the DME still cranks the car & it idles, DME good!
'06 M3 ZCP Titanium Silver w/PP + Nav.
'10 335i M-Tech

Last edited by M54B25; 11-17-2008 at 09:40 PM.
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Old 11-07-2009, 11:51 PM   #4
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Join Date: Nov 2006
Location: NC
Posts: 33
My Ride: 88M3, 95M3, 01M3
i think the o2 heaters circuts are built into the dme.. i would check connections first and replace o2 sensor b4 buying a expensive dme that would have to be programed for your car.
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