lucasb7

To wrap this up, the issue solution provided by other members did solve the problem.

here is the text from the Audi workshop:
CONFIRMED CUSTOMER CONCERN. CAN HEAR RATTLING NOISE WHEN DRIVING THROUGH PARKING LOT. RAISED VEHICLE AND TECH RAISED RPM TO 1500. RATTLE COMING FROM EXHAUST PIPE COUPLING TO CATALYTIC CONVERTER ON BOTH SIDES. REMOVED MUFFLER FROM CATALYTIC CONVERTER PIPING. WHEN HITTING CATALYTIC CONVERTER PIPING, RATTLE CAN BE HEARD. AND WHEN PRESSURE APPLIED WITH SCREWDRIVER ON CATALYTIC CONVERTER WHEN CAR RUNNING, NOISE GOES AWAY. REPLACED BOTH EXHAUST WITH MUFFLER ASSEMBLY PER AUDI GUIDELINES. ALIGNED EXHAUST WITH JACK TO RELEASE TENSION OF EXHAUST MOUNTS. REMOVED CLAMPS ON BOTH EXHAUST. REMOVED MUFFLER ASSEMBLY FROM FRONT CATALYTIC CONVERTER FLANGE ON DRIVER AND PASSENGER SIDE. REMOVED BOTH MUFFLER ASSEMBLYS CLEANED FLANGE AND MATING EXHAUST ON BOTH SIDES. INSTALLED JACK UNDER EXHAUST TO LINE EXHAUST MOUNTS AND RELIEVE TENSIO INSTALLED NEW MUFFLER ON BOTH SIDES. REPLACED ALL BOLTS FOR FLANGE MATING AS WELL AS FRONT CLAMPING SLEEVE AND BOLTS ALL BOLTS TORQUED TO 23NM. ROAD TEST IN PARKING LOT, RATCHETING NOISE GONE

Thanks for the help!

GOFASTER67

Identical problem with my 2012 3.0T. Was this covered under warranty??

Wuplur

lucasb7

Yes my issue was covered under the extended warranty. At the time the car had about 55k miles.

baller46

I have the exact same problem with my 2012 A6. I had the car at the dealership recently for an alignment and fully describe this issue and asked them to check it out. They told me that the sound was normal. But I knew it was something that I had not heard prior to the last couple weeks. I've read the previous post but still not exactly clear on what the issue is...what do I tell the dealer needs to be done? Is there a TSB on this issue?

KickAss

I was the one who commented on that video for guidance. Since then, I experienced another major exhaust crack and had to replace the rear muffler section. The root cause of the issue is unknown to me. It is perhaps the same as you listed in your later post with dealer notes. I am actually pretty pissed with this car. Dealer won't diagnose it properly, indy shop cannot, everyone just wants to throw parts at it and keep their fingers crossed while I bleed money. My vehicle is a 2012 A6 3.0T as well.

kevrhof

I have this sound on my car at exactly 1400rpms, not higher or lower but 1400. It doesn't seem as loud as the video though

Bartenderfloyd

I have the same rattle as well. It's just annoying so I'm going to live with it.

kevrhof

Took the car to my shop today with a couple concerns to include this. They were able to duplicate it and say its coming from the resonator. They said it just seems to be a design flaw in my car as the resonator itself was functioning well, just was rattling at this certain RPM due to vibrations. Obviously they said if it gets worse, itll need to be looked at

Vodka G

yep is the cats I had the same issue and had both of them replaced under CPO warranty