Thanks everyone for the replies. I think it's related to the regen though there is no way to tell when it's doing it. The truck is new. Only about 1300 miles on it so far. Have noted the smell a couple time. Last time as pulling back in the driveway, could smell it in the cab. Left the truck running and when I got out the smell seemed to be concentrated around the front driver side wheel well. No where else around truck. (Nothing at the exhaust) Fair amount of warm air blowing out of there. (Wheel well). First truck with DEF so not familiar with it and the expectations.
2019 F350 6.7L DRW CC LB 4x4 Lariat
B&W Companion 20K for OEM pucks.