ar4920g1035ug

Remove/install NOx sensor at exhaust aftertreatment unit entrance

Type ar · topic 49.20 · version 0201 · 2017-04-24

Applies to: Engine 934.97, 936.97 in model 405 with code M5L (Engine version Euro VI version 2) Engine 934.97, 936.97 in model 405 with code M5M (Engine version Euro VI, with OBD-C) Engine 934.97, 936.97 in model 405 with code M5Z (Engine version, Euro VI)

Where it sits

Function group 1 Engine › 49 Exhaust system, exhaust gas cleaning › 49.20 Exhaust gas aftertreatment — Series 405 · Series 934 (models 97*) · Series 936 (models 97*)

EinPAS 15 Engine › 15.40 Exhaust system/exhaust aftertreatment › 15.40.12 Sensor/switch/wiring harness — Series 405 · Series 934 (models 97*) · Series 936 (models 97*)

AR49.20-G-1035UG

Remove/install NOx sensor at exhaust aftertreatment unit entrance

21.04.2017

Engine

934.97, 936.97 in model 405

with code M5L (Engine version Euro VI version 2)

Engine

934.97, 936.97 in model 405

with code M5M (Engine version Euro VI, with OBD-C)

Engine

934.97, 936.97 in model 405

with code M5Z (Engine version, Euro VI)

Remove/install NOx sensor at exhaust aftertreatment unit entrance

1

Electrical connector

2

Bracket

3

Electrical line

4

Exhaust aftertreatment unit

A70

NOx sensor control unit, exhaust aftertreatment unit inlet

A70 b1

Exhaust aftertreatment unit inlet NOx sensor

G49.20-3118-82

Warning

Risk of injury. Skin or eye injuries may result when handling hot or glowing objects.

Wear protective gloves, protective clothing and safety glasses, if necessary.

AS00.00-Z-0002-01A

Caution

Risk of injury caused by scraping or cutting body parts on sharp vehicle parts

Always wear protective gloves when working on or near sharp and non-deburred vehicle parts.
Deburr repair panels.

AS00.00-Z-0017-01A

Topical note

Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A

Remove/install

1

Switch off ignition

2

Remove EATU inlet NOx sensor (A70  b1) at the exhaust aftertreatment unit (4)

Note on calculation of tightening torque when using insertion or socket tools with various effective lengths

AH00.00-P-0015-01CW


Only place tool on hexagon of the union nut.
The EATU inlet NOx sensor (A70  b1) will be destroyed otherwise.


After removal of the EATU inlet NOx sensor (A70 b1) the sensor tip must be protected against moisture.
The EATU inlet NOx sensor (A70  b1) will be destroyed otherwise.

Installation: For new installation genuine Mercedes-Benz NOx sensors are already lubricated with hot lubricating paste on the thread of the union nut.
For reinstallation clean the thread of the union nut and coat with hot lubricating paste.

NOx sensor to exhaust aftertreatment unit

*BA49.20-N-1007-01A

Paste, hot lubrication 1 kg, DBL 6879.20

*BR00.45-Z-1005-06A

3

Expose electrical line (3)

4

Remove EATU inlet NOx sensor control unit (A70) on bracket (2)

NOx sensor control unit to bracket

*BA49.20-N-1008-01A

5

Disconnect electrical connection (1)

6

Remove EATU inlet NOx sensor (A70 b1) together with the EATU inlet NOx sensor control unit (A70)

The EATU inlet NOx sensor (A70 b1) and the EATU inlet NOx sensor control unit (A70) form a unit.

7

Install in the reverse order

Exhaust aftertreatment unit

Number

Designation

Model 405 with engine 934.9, 936.9

BA49.20-N-1007-01A

NOx sensor to exhaust aftertreatment unit

Nm

50

Exhaust aftertreatment unit

Number

Designation

Model 405 with engine 934.9, 936.9

BA49.20-N-1008-01A

NOx sensor control unit to bracket

Nm

8

Repair materials

Number

Designation

Order number

BR00.45-Z-1005-06A

Paste, hot lubrication 1 kg, DBL 6879.20

A 000 989 76 51

Referenced documents