Remove/install NOx sensor with controller unit · ar1440w2038b · Mercedes-Benz WIS

AR14.40-W-2038B

Remove/install NOx sensor with controller unit

22.3.11

ENGINES 457.9 in MODEL 940, 942, 943, 944 with CODE (MS4) BlueTec 4

ENGINES 457.9 in MODEL 940, 942, 943, 944 with CODE (MS5) BlueTec 5

W14.40-1389-09

1 Electrical connection

2 Electrical line
(NOx controller unit to NOx sensor)

3 Muffler
(with reduction catalytic converter)

A113 Ox sensor with controller unit

A113a1 NOx sensor controller unit

A113b1 NOx sensor

4 Bracket

5 Bolt

6 Electrical line
(NOx controller unit to separation point)

 	Remove/install
	Notes on self-locking nuts and bolts		AH00.00-N-0001-01A
1	Switch off ignition
2	Remove NOx sensor controller unit (A113a1) at holder (4)	 The NOx sensor controller unit (A113a1) and NOx sensor (A113b1) create a unit and can only be removed together.
		 The NOx sensor controller unit (A113a1) must also be removed first otherwise the electrical line (2) could be damaged by twisting when removing the NOx sensor (A113b1).
			*BA14.40-N-1043-02B
3	Disconnect electrical line (6) at electrical connection (1) and detach electrical line (2) out of brackets
4	Remove NOx sensor (A113b1)	 Only place tool on hexagon since the component is very sensitive and can be easily destroyed.
		 Installation: Coat thread on NOx sensor (A113b1) with paste.	*BR00.45-Z-1005-06A
			*BA14.40-N-1042-02B
5	Install in the reverse order

 Exhaust aftertreatment

Number	Designation		Engine 457.9 with code MS4 or code MS5


BA14.40-N-1042-02B	NOx sensor on muffler	Nm	50
BA14.40-N-1043-02B	NOx sensor controller unit on holder	Nm	12

Repair materials

Number	Designation	Order number
BR00.45-Z-1005-06A	Paste, hot lubrication 1 kg, DB supply specification 6879.20	A 000 989 76 51