Would appreciate some feedback!

Got an '08 A4 / 3.2 / quattro with only 7k miles. On my way home from pickup at the dealer's shop doing a 7500 mile maintenance (essentially an oil change!), I got a "check engine" light. After a week of diagnosis, they tell me it's due to excessive carbon buildup on the intake valves and need to replace the injectors.

Is this at all possible on a new car which has had only good gas used in it? Is it possible the dealer could've done something to cause this?

 

Define "good gas". Only Chevron touches my tank, 130k and no carbon. Get a VAG or ask what the code states. If you put a solvent/mix-in with gas, to clean the carbon, the code should reset itself after no more than 2 weeks.