I found out this past summer that my rear subframe on my Audi Q5 (2012) had rusted out to the point of being dangerous to drive. Looking into it, this is apparently a common problem due to the 1st and 2nd generation design of the Q5 where they placed a wind deflector over the rear subframe. In doing so, that wind deflector collected and held moisture and corrosive agents against the frame to the point where it was completely rusted through. I was told my Q5 was not safe to drive until I got the rear subframe replaced. The Audi dealership that I ordered the subframe from (Rockville Audi) said they have been increasing the number of subframes on order as this is becoming a consistent problem. When I spoke with Audi of America about it, they said they did not believe it was an issue beyond regular aging of the vehicle but I disagree as I have other vehicles with many more years that do not have complete sections of the frame rusted/rotted out.