Remove/install NOx sensor upstream of SCR catalytic converter

AR14.40-S-2059E

Remove/install NOx sensor upstream of SCR catalytic converter

19.08.2020

Model

447 with engine 622.9

Model

447 with engine 651

except code MF4 (Emissions category Euro 4 N1 GR.III/N2)

Modification notes

14.08.2018

Special tool 000 589 71 03 00 box wrench bit added

Step 5

14.08.2018

Method extended

Operation steps 10, 11

12.10.2018

Information changed

Step 5

Shown with ENGINE 651

1

Electrical connector

3

Nut

B29

NOxsensor 1 upstream of SCR catalytic converter

2

Electrical wiring harness

A97/1

NOxsensor control unit upstream of SCR catalytic converter

Shown with engine 622

1

Electrical connector

3

Nut

B29

NOxsensor 1 upstream of SCR catalytic converter

2

Electrical wiring harness

A97/1

NOxsensor control unit upstream of SCR catalytic converter

 Danger

Risk of death caused by vehicle slipping or toppling off of the lifting platform.

Align vehicle between vehicle lift columns and position the four support plates at the vehicle lift support points specified by the vehicle manufacturer.

AS00.00-Z-0010-01A

 Warning

Risk of burn injuries, suffocation and poisoning when working on the exhaust system and the components connected to it. Risk of suffocation and risk of poisoning caused by inhalation of gaseous and solid components of the exhaust. Risk of poisoning caused by skin contact with solid components of the exhaust.

Wear protective clothing and safety glasses. Use the extraction system. Move people out of the hazard area.

AS49.00-Z-0001-01A

 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

Topical note

Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A

 

Remove/install

1

Remove the underfloor paneling on the right.

Model 447.##/## ## up to 048754 with engine 651 with code MX0 (BlueEFFICIENCY package) Model 447.8## ## as of 048755 with engine 651 with code MX0 (BlueEFFICIENCY package) with code VQ1 (AVANTGARDE)

AR61.30-S-1001E

2

Raise vehicle.

AR00.60-S-1000E

3

Disconnect electrical connector (1).

4

Remove electrical wiring harness (2) of NOx sensor 1 upstream of SCR catalytic converter (B29).

 To do so, unhook electrical wiring harness (2) and remove cable ties.

 Installation: Replace cable tie.

5

Remove NOx sensor 1 upstream of SCR catalytic converter (B29).

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

AH00.00-P-0015-01CW

 Installation: Apply some heat-resistant lubricating paste to thread of nut of NOx sensor 1 upstream of SCR catalytic converter (B29) to be reused.
A protective coating is already present on thread of nut of a new NOx sensor 1 upstream of SCR catalytic converter (B29).

 Model 447 with engine 622.9Nut, NOx sensor upstream of SCR catalytic converter to exhaust pipe

*BA14.40-N-1010-02L

 Model 447 with engine 651Nut, NOx sensor upstream of SCR catalytic converter to diesel particulate filter

*BA14.40-N-1009-02L

Paste, hot lubrication 1 kg, DBL 6879.20

*BR00.45-Z-1005-06A

 Box wrench bit

*000589710300

6

Remove NOx sensor control unit upstream of SCR catalytic converter (A97/1) with NOx sensor 1 upstream of SCR catalytic converter (B29).

Topical note

Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

 To do so, unscrew nuts (3).



Clean

7

Clean thread and sealing surfaces for NOx sensor 1 upstream of SCR catalytic converter (B29) in exhaust system.

8

Install in the reverse order.

9

Read out the fault memory using the diagnostic unit.

If NOx sensor control unit upstream of SCR catalytic converter (A97/1) was replaced.



Connect STAR DIAGNOSIS and read out fault memory

AD00.00-S-2000-04E

If existing faults are shown:



Erase the fault memory.

10

Perform initialization of NOx sensor control unit upstream of SCR catalytic converter (A97/1) with diagnostic device.

If NOx sensor control unit upstream of SCR catalytic converter (A97/1) was replaced.

11

Disconnect diagnostic unit.

If NOx sensor control unit upstream of SCR catalytic converter (A97/1) was replaced.



Check

 Warning

Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running.

Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.

AS00.00-Z-0005-01A

12

Check exhaust system for leak tightness while engine is running.

 Visual inspection only.

 Assembly parts for exhaust aftertreatment

Number

Designation

Model 447 with engine 651

BA14.40-N-1009-02L

Nut, NOx sensor upstream of SCR catalytic converter to diesel particulate filter

Nm

60

 Assembly parts for exhaust aftertreatment

Number

Designation

Model 447 with engine 622

BA14.40-N-1010-02L

Nut, NOx sensor upstream of SCR catalytic converter to exhaust pipe

Nm

60

Repair materials

Number

Designation

Order number

BR00.45-Z-1005-06A

Paste, hot lubrication 1 kg, DBL 6879.20

A 000 989 76 51