Carrier/rack problems of the 2012 Volkswagen Passat

Went to vw dealer and had cel on. Diagnosis was def heater failure. This is a common problem with these cars and without the heater function def fluid freezes at 12 degrees. Car has always been dealer maintained and called vwoa and was told part is only covered 3 /36. The car currently has 60000 miles. So they charged me 100 dollars for diagnosis and car is in the shop currently for the repair at quoted 971. 00 dollars. This def system is certainly part of the emissions system and should be covered under warranty. I really thought about just driving the car until the buyback but felt I may damage another part of this complicated system. The vehicle still drove fine but was probably spewing even more pollutants into the air than it normally does . It seems silly that I am spending 1071. 00 to only have vw buyback in the fall. This is a well known problem with these cars and I feel a component that vw should extend the warranty on. So much for vw and my " clean diesel " I also have 2 other open recalls with no parts for repair yet. Just got a call from the dealer they cracked the def pump while making the repair to the heater,parts ordered. Unbelievable!.