Definition of node. 1a : a pathological swelling or enlargement (as of a rheumatic joint)b : a discrete mass of one kind of tissue enclosed in tissue of a different kind.
Diesel exhaust fluid (DEF) from a separate tank is injected into the exhaust pipeline, where the aqueous urea vaporizes and decomposes to form ammonia and carbon dioxide. Within the SCR catalyst, the NO. x are catalytically reduced by the ammonia (NH. 3) into water ( H2O) and nitrogen (N.
In addition, the filling cap for the DEF tank is blue and will be clearly marked 'Diesel Exhaust Fluid' with the accompanying ISO standard number. However, a small number of cases have been reported where diesel has been put in the DEF tank.