NEED HELP!!!!!!!
Any search for P2015 and Audi B8 A4 should have turned up the most common cause of that issue on our vehicle, the intake manifold. Have you checked that? Likely the issue since you have a simultaneous P2279 (lean, i.e. excess air ingestion).
https://www.ecstuning.com/b-ecs-part...021071ecs01~a/
$60 is less than the cost of a new intake manifold, but I made my own bracket from spare pieces. You just need something to keep that post pushed in until you finally get a new intake manifold.







