Autoblog and Yahoo may earn commission from links in this article.Luxury SUV Ownership Comes With An Unexpected SurprisePicture this: you drop serious cash on a luxury SUV, expecting years of smooth, worry-free driving, only to discover your prized ride is quietly rusting away underneath. That's the claim of some Audi Q5 and SQ5 owners, and now they're dragging Audi into court to answer for it.A fresh class-action lawsuit says that 2009 to 2017 Audi Q5 and SQ5 models have a big problem with their rear subframes – the part that keeps the suspension, drivetrain, and wheels in check. But this isn't your run-of-the-mill surface rust. Owners claim the corrosion is sneaky, hiding out of sight until it's already done some serious damage.AdvertisementAdvertisementThe whole thing kicked off when a Maryland owner of a 2015 Q5 found a nasty surprise during a regular checkup: once the mechanic peeled back the plastic covers on the subframe, there was rust everywhere.AudiThe Alleged Design Flaw Behind The CorrosionThe heart of the lawsuit is Audi's plastic protective covers on the rear subframe, which, according to owners, are doing the exact opposite of protecting anything.Instead of keeping the elements out, these covers apparently trap water, salt, and road grime right up against the steel, giving rust a perfect hiding spot and making it nearly impossible for owners or mechanics to spot the problem until it's too late.The lawsuit says this hidden rust can eat right through the subframe, leaving holes and weakening the structure. Since the subframe is what keeps your suspension and drivetrain together, owners argue that letting the rust go unchecked could turn into a real safety hazard.AdvertisementAdvertisementPlenty of owners have already sounded the alarm, filing complaints with the NHTSA and swapping horror stories on forums. The repair bills aren't pretty – some owners are staring down costs ranging from a few grand to $10,000, depending on how bad the rust has gotten.To make matters worse, owners say Audi often refused to cover these repairs under warranty, leaving them to foot the bill themselves.AudiWhat Happens Next?Right now, these are just allegations – Audi still gets its day in court to argue its side. The plaintiffs want this to become a class action, so other Q5 and SQ5 owners can jump in. They say Audi should have known about the rust problem from all the warranty claims, dealer reports, and customer complaints piling up.Whether the court buys it is anyone's guess. These cases can drag on for years, and the ending could be anything from a quick dismissal to a big settlement or a drawn-out court battle.AdvertisementAdvertisementIn the meantime, expect plenty of Q5 and SQ5 owners – especially in salty, snowy states – to start peeking under their SUVs. If you own one, it might be time for a closer inspection.AudiThis story was originally published by Autoblog on Jun 11, 2026, where it first appeared in the News section. Add Autoblog as a Preferred Source by clicking here.