Remove/install NOx sensor

AR07.70-P-0001TX

9.3.10

ENGINE 272.985 in MODEL 211.057 /257, 219.357

P07.70-2090-06

Shown on left catalytic converter

1 Crossmember

2 Sheet metal nuts

3 Plastic nuts

6 Electrical connector

N37/5 Left NOx (nitrogen oxides) control unit

N37/5b1 Left NOx (nitrogen oxides) sensor

N37/6 Right NOx (nitrogen oxides) control unit

N37/6b1 Right NOx (nitrogen oxides) sensor

 	Remove/install
	The NOx control unit (N37/5, N37/6) and NOx sensor (N37/5b1, N37/6b1) are one component and can be removed together
1	Raise vehicle with vehicle lift	Model 211	AR00.60-P-1000T
		Model 219	AR00.60-P-1000TX
2	Remove crossmember (1)	 Model 211	*BA62.30-P-1001-01A
		 Model 219	*BA62.30-P-1001-01C
3	Unscrew sheet metal nuts (2)
4	Unscrew plastic nuts (3)
5	Disconnect electrical connector (6)
6	Detach NOx control unit (N37/5, N37/6) from undercarriage		*BA07.04-P-1002-01E
7	Remove NOx sensor (N37/5b1, N37/6b1) from exhaust pipe	 Only place tool on hexagon since the NOx sensor is very sensitive and can be easily destroyed.
		 Installation: Coat thread on NOx sensor with heat-resistant lubricant.	*BR00.45-Z-1005-06A
			*BA07.04-P-1001-01E
8	Install in the reverse order

NOx sensor

Number	Designation		Engine 272.982/983/ 984/985


BA07.04-P-1001-01E	NOx sensor to exhaust pipe	Nm	50
BA07.04-P-1002-01E	NOx sensor control unit to vehicle underfloor	Nm	8

 Crossmember and front reinforcement

 Crossmember and front reinforcement

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