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I just did this on my e93. This requires removal of the plastic taillight cover as well as the carpeted plastic piece on the side of the trunk. It's kind of a pain. What I did was pop out the 2 grey retainers near the top and bend the piece down to look inside. You will see the plug right there.... Kind of hard to get your hands in there.
I took it out for a spin, and noticed the tach bobbling a little bit after getting up to speed and releasing the gas, as the transmission upshifts to the highest gear. I have steptronic, obviously. I haven't read anything about this so maybe I'll give it a few days, maybe the ECU is used to dealing with backpressure and needs to relearn something.
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