code 2EF4 (279B) - help the newbie! - Bimmerfest - BMW Forums

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E63 / E64 6 Series (2004 - 2010)
The E63/E64 BMW 6 Series builds on BMW's sporty heritage with aggressive lines and an incredible motor to back the design up. Available in coupe and convertible trims with a standard 4.8 liter engine producing 360 horsepower and 360 lb-ft of torque, the 6-series is a popular choice that exceeds expectations.

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Old 10-10-2012, 07:07 AM
Cectra Cectra is offline
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Location: St. Louis, MO
Join Date: Sep 2012
Posts: 18
Mein Auto: '05 645 vert
code 2EF4 (279B) - help the newbie!

Hi all! I'm sort of new here, been reading a lot of stuff for a while but my first post. I have been on the other bimmer forum for some time but seem to find better info and friendlier peeps here. Also it seems more of 6 series owners are on here.

So here's my problem. Got the engine light on my 2005 645 conv, increased emissions. Went to the dealer to check it out. They came back with code 2EF4 (279B). According to the BMW bulletin from April 2010 (SIB 12 15 05), 6ers made between 09/04 and 12/04 have faulty engine harness and temp sensors and they need to be replaced. Normally, they would start with replacing the thermostat but for my car production date fitting within these 3 months. The wiring harness is 'spensive to replace! I took the car in to an independent reputable shop. They suggested to start with thermostat anyway because the wiring clamps show no signs or burns or corrosion.

I'm a female and I'm always suspicious that the guys at any repair shops are trying to take advantage of me. I know a bit to know an obvious BS but on this one I'm not sure.

Please help, what should I do?

Last edited by Cectra; 10-10-2012 at 07:09 AM.
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