The biggest issue as said by many is the timing chain tensioner failure which is of course catastrophic. There was a recall for this, I bought my 77tsi manual with the work done only 10k prior to my purchase #win.
The waste gate actuator can also rattle, there was also a recall for this from memory, but I know that there are shims made to fix the issue, it's really only a nuisance, and only when revving while stationary.
Lastly the fuel line can rattle, this is incredibly irritating but very trivial. Can be fixed with some foam, sounds like the engine is knocking but it's only the fuel line.
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