Need to check my Bentley, but this sounds like you have a loose ground screw somewhere in the engine bay, or went through a *really* deep puddle sometime recently. IIRC, just about everything you mentioned has some part of it's system on the passenger side of the engine bay.
What year/engine/code do you have??
This looks legit - it's not the dealer's fault your ecu had 10 fault codes. They clear codes as part of the diagnosis to see if they return, or were truly "sporadic". The vag-com printout from the initial read is standard (according to bentley). I'm not sure I follow what the dealer did wrong - so far this sounds better than average. Some dealers would be trying to sell you a new MAF, Turbo, and Cat right now.
What year/engine/code do you have??
This looks legit - it's not the dealer's fault your ecu had 10 fault codes. They clear codes as part of the diagnosis to see if they return, or were truly "sporadic". The vag-com printout from the initial read is standard (according to bentley). I'm not sure I follow what the dealer did wrong - so far this sounds better than average. Some dealers would be trying to sell you a new MAF, Turbo, and Cat right now.