welcome to the group yes the injector is in front of the dpf on the driver side to remove it takes I bolt take it off put in pot of hot water and clean all the caked on salt off of it depending who rebuilt the engine it may last longer than the factory one
the eco diesel has more problems than most people realize if I had a few hours to list them I would. make sure the expansion tank is full 2 the line if the cooler is leaking that would cause no heat due to low water. if the cooler is leaking fmc has none they r backorderd
IF U never had a problem u must b blessed I would take it back 2. whoever put the crank ring on it maybe there is a problem with the repair u just had done