SCR catalytic converter with AdBlue injection The following can be seen: catalytic converter, AdBlue injection valve, mixer. As we worked on used catalytic converters here, you have to face slight discolorations. description ordernumber 1366 see also: Mercedes-Benz A Class diesel engine with common rail technique Ecotronic system (carburetor) MAN direct injection with bowl-in piston VP 44 (Bosch) radial-piston distributor-type injection pump