Recently I could hear a popping noise from the front with a momentary loss of power so that car bops a little between 30-50mph. When this happens you see the boost gauge fluctuating quickly so Iím guessing an issue with the first turbo as on the motorway itís fine or I donít notice the issue. The car is booked in as itís under warranty.

The VCDS shows no fault when running a scan, so how can you check if there is an issue with the turbo from VCDS?