2010 S4 mechatronic replaced at 45k miles
I noticed the signs of a bad mech unit probably around 30k miles, but it wasn't that big of a deal at the time for it happened once in a blue moon.
The issue was getting worse as the car put on more miles. I had the infamous rear end bang when coming to a stop only after the car was warmed up or hot, or in traffic as well as the banging between P-R-N-D and vice versa when stopped after a hot day.
I ended up being able to replicate it for the dealer and after a few weeks they had it replaced at ~45k all under warranty.
I was TD1 at the time (APR stage 2, custom exhaust, intake, etc), but dealer replaced under warranty anyway as per direction from Audi of America.
Car has been smooth as silk shifting ever since the replacement, and unlike a few others, I did not lose my DSG fart.
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