So I'm thinking if you haven't recently or ever.... you should get your MAF readings checked and your lamda sensor.
It's a small price to pay compared with a rebuild.

MAF sensor is 75 plus vat and the lamda 95 plus vat so not a major expense really.
Even with both sensors failing and checking with my VAG-com software the car showed no faults prior to meltdown or after!!!!!!!
Also Audi had it twice and didn't check these when investigating prior to meltdown.......