So my 4 month old brand new A4 started making a knocking sound from behind the passenger dash board when in stop in go traffic, when you'd go from 5 mph to a stop, back to 5 mph. A side temperature flap for the HVAC system had broken and made the knocking sound. They replaced from the bill: heater box assembly, housing, 2 outlet hoses, and the car radio (yes the radio). Total cost $5000+ marked down to no cost due to the warranty.
I am amazed at the cost for such a small knocking noise. I am pleased the dealer went to the trouble to diagnose and fix the problem.
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