A rattling noise from the timing cover, all engine cylinders misfiring, car died and won't restart or extended engine cranking time are all symptoms of a failed timing chain tensioner. This particularly applies to Volkswagen Audi 2.0 TSI engines from 2008-2013 with engine code CCTA, CBFA, CAEB and CPMA which comes with the inferior chain tensioner. We now dive in by removing the front nose of the car and have the timing covers removed.
The TSI timing chain tensioner has been updated several times due to their failure rate. The tensioner in question is highlighted in purple. When this component fails, it applies less tension causing the timing chain to get loose and rattle. Once the timing chain jumps timing, being that this is an "interference engine", it can lead to catastrophic engine failure as the internal engine components collide against each other, e.g. intake or exhaust valve making contact against the piston.
To avoid a costly engine failure in the thousands, we recommend to have the timing chain service performed preventively. This service includes replacing the timing chain with new guides and tensioner, resealing the timing cover and valve cover with updated components.
Many of these Volkswagen owners in the link below were not so lucky with engine failures reaching $10,000.