MTU 16V4000M73 Operating Instructions Manual page 41

SCR catalytic converter, left side
M81.3 Dosing unit 1.1
M81.4 Dosing unit 1.2
M81.5 Dosing unit 1.3
M80.1X1 X-VE 1.1 / X1
M80.1X2 X-VE 1.1 / X2
M80.2X1 X-VE 1.2 / X1
M80.2X2 X-VE 1.2 / X2
M80.3X1 X-VE 1.3 / X1
MS150123/01E 2017-05 | General Information | 41
M80.3X2 X-VE 1.3 / X2
XWA1 Adaptation bypass