Lurking long time - never needed to post, just search and follow M2 development - here goes nothing...
2012 135i stock. Purchased CPO with 35k miles. Had this issue from day one despite the update being a condition of the sale. Forward a few months, first oil change happened to coincide with my gauge cluster freaking out (
http://www.1addicts.com/forums/showthread.php?t=1158660). Spoke with my SA about doing the oil change, addressing the cluster freak out and actually updating the DME. Provided the SIB and I was told it would be done.
Picked it up with nothing on my docs about the update. Explanation: my SA stated that the DME has to be updated when the RDC is replaced. Based on what I've read, the RDC doesn't seem to require a DME update - but that's why I'm here.
Forward another 6 months: The car is back to square one - throttle lag, surging at stops, almost stalling occassionally - so it seems I'm another one in the "yeah it's fixed" but really they just reset the throttle adaptations.
Does anyone know if it's accurate that the DME must be updated when the RDC is replaced? I'd like to be able to ask why the update was not performed and why I was told something that is not true.