[oilburner]

Got a message 85 miles to 65 mph max service exhaust fluid system. 166000 miles and been trouble free other than a EGR valve around 52000 miles . So of to the dealer see what they say the diagnosis is.

same message an countdown for me an ended up being exh. temp sensor #2............that message is somewhat generic for several problems.

 

[oilburner]

My car didn't go into count down when the DEF heater went. Just threw a checklight.

same here.