starlight
Active Member
My car has just been handed back after a major (B7) service (61,000 miles). The work, carried out by a trusted M-B dealer, included the latest M-B software update. I’m now hearing a loud hum at speeds north of around 40 mph, almost like a jet engine noise. It’s not unlike the sound an engine might make when an upward gear change is needed, but the auto box does move through the gears without difficulty.
I need to get back to the dealer but would like to be forearmed with any intel a forum member may be able to provide.
I need to get back to the dealer but would like to be forearmed with any intel a forum member may be able to provide.
