Started the car after work...noticed the friggin CEL light all of a sudden. I turned off the car and said...no fkn way. Started it it again, it popped back on. I started to drive home and in about 1-2 miles the DIC reads...SERVICE EXHAUST FLUID SYSTEM. Then the DIC changes and says 78 MILES UNTIL 65 mph MAX SPEED. Def is full, no problem there. Called the dealer on my way home. can't get in until Thursday. There are 31,000 on the car. I haven't any any issues since the last issue with the NOX sensor about 20,000 miles ago or so.