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Ok, Derby Audi phoned a short while ago to deliver two lots of bad news and one piece of excellent news. The fault is not covered by the warranty and the cost to me would be between £3k and £4k. Basically it needs a whole new glass roof and all components. Fortunately, Audi HQ and the sales team at the dealer are going to split the cost between them so I don’t have to part with anything. One positive review coming up on Google once I have it back around the 19th

Welcome to the forum Gurdeep, you'll find the members on here are a friendly and helpful bunch :) As the others have said, this is normal and is just the Diesel particulate filter doing a regeneration. This basically helps keep the dpf clear and stops it clogging with soot. Cheers Steve

It trying to do a regen of the DPF. Take it a steady run up the motorway at above 2000rpm for 20 - 30 minutes for it to clear. If it doesn't get a chance to complete then the DPF fills up with soot and will eventually cause possibly expensive problems.

Your avatar says your car is a diesel.......... You will get a sound like the cooling fan whirring when the DPF is doing a regen. Had that with all my diesels........