Glad the forum was helpful regarding the central locking 🙂
I'd recommend getting it checked a a garage, an Audi independent specialist if possible.
Is the car pumping out blue smoke?
Have you checked for any oil leaks, such as from the oil cooler or turbo?
You might have to remove the undertray and put cardboard under it to test for a leak or see if the engine is coated in oil.
But as Cliff has highlighted It is a common fault with some Audi engines of that period. Piston rings were not not up to par until 2010 but my early 2010 2.0 TSI is fine. There were lots of models affected across the VAG group and we're fixed under warranty.
I wouldn't have thought your 12 year old motor would be covered now, but worth a shot speaking to Audi. This will depend on the cars service history and mileage.
But ultimately you would need new piston rings to cure the problem.