My 2015 Eco Diesel With 78,xxx miles, just popped this code, P20EE. Into dealer & will get SCR NOx Cat replaced. 3 days to get part. DEF has been an ongoing issue with this truck since new. Also noticed coolant loss for past several months. Dealer came back with “new water pump & radiator leak”. This boggles my mind. I’ve driven vehicles for 180,xxx miles that never needed pump/radiator replacement. I’m questioning the quality of C F products.