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The problem with a lot of modern cars, and other equipment for that matter, is there are certain things that need to be done by an authorised (& therefore appropriately trained) service centre. A lot of information doesn't get out to mainstream repairers and they often just take a best guess based on what they've done in the past. What worked on a 1966 beetle wheel bearing isn't going to work on a 2009 Passat. I'd talk to a dealer & a bearing specialist. I'd assume you have a CBC bearings in your area somewhere. I've always found them to offer good technical advice.
Lewis, I suppose you don't have the bearings that were replaced. But if you do, send me some closeup pics and I'll most likely be able to determine the cause of the failure.
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