Just purchased an 02 A6 2.7T (first Audi). Didnt seem obvious at first but am noticing coolant reservoir keeps emptying in about a weeks time. No visible leaks or puddles of coolant under car. Is this a head gasket issue? Also diagnostic check indicated:
17819-Secondary Air Injection System; Bank 2: Insufficient Flow
P1411-35-10 - - intermittent
Could this cause coolant evaporation?
Any info would be appreciated.
Thanks,
DJF

 

you should post this in the A6 forum - you'll get more response than here

 

Will do thanks
DJF