I have been fighting this P2015 code for a while now. I went ahead and bought an intake manifold from ECS and was getting ready to put it in. I stopped by the dealership to pick up some clips and just asked one of the service guys about it. It turns out that the intake is covered under warranty for 120,000 miles or 10 years from in service date along with the DSG transmission. just thought you all would like to know that!