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Hi Gareth, That was a mighty fast reply...! I've been driving it about since yesterday without any problems. It now drives as it did 5 years ago. I also have no engine codes at all now, which is the first time for around 4 years...! When I start the engine the noise I mentioned is quite loud, but as it comes up to temperature it quietens and can only just be heard; while driving I cannot hear it at all. The noise is definitely not inside the block. As far as I can tell it's timing chain related, i.e. most likely the chain adjuster, or could even be one of the guides, but less likely. I'm going to purchase an adjuster, and maybe a chain guide kit, and replace it/them. It's not a job I relish though, because working on the top with the cam ends is easy as you only have to slide the front forward on 2 long and appropriate bolts, but for the lower end I'd need to either take the front off (oil and water removal), or at least remove the radiator to provide access; any advice on that...? I'm not going to drive it now until I've checked/fixed, just in case. Thanks, Paul.

Thank you for getting back Gareth. 2 years unlimited miles warranty so I am good there. Its just a bummer when new cars come across these issues. Going to take it to Audi on Monday. Let's see what they come up with.