on RO before RO is closed at your
dealership.

p
A sufficient power supply to the
vehicle on-board system must be
ensured throughout the entire work
procedure.
Otherwise any undervoltage that
occurs may damage the control
units.
i
Do not connect the battery charger to
the auxiliary battery in the engine
compartment.
i
Follow the operating instructions for
the battery charger.
i
Use a Mercedes-Benz recommended
battery charger to ensure an
adequate voltage supply (min. 12.5 V)
is provided for the on-board electrical
system battery.

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Emissions Campaign 2020040006

5

Ensure XENTRY is fully updated with the
latest release and all available add-ons.

6

Connect the diagnostic system. Make sure
that the OBD2 connection cable is
connected directly to the factory X11 / 4
diagnostic socket and not via an adapter
cable.

7

Switch on the ignition.

9

i
Ensure Vehicle Identification Number (VIN)
readout in XENTRY/DAS matches vehicle
VIN markings exactly. If not, please open a
PTSS case with photos of VIN markings and
XENTRY/DAS Quick Test showing VIN
readout.
i
Pre-existing faults causing a Check Engine
Light must be evaluated. Reference PreInspection Notes on page 2.

i
The diagnostic system remains connected to
the vehicle throughout the work procedure!
Do not disconnect the diagnostic system’s
online connection.
8

Run XENTRY and perform Quick Test. Upload
Initial Quick Test print-out to paperless pXD.

i
The procedure via the diagnostic system is
shown on the following pages.

Start the diagnostic system.
10

Perform Emissions Modification Pre-Inspection.

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Emissions Campaign 2020040006

First

Third
Second

24

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Emissions Campaign 2020040006

25

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Emissions Campaign 2020040006

26

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Emissions Campaign 2020040006

Wait

27

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Emissions Campaign 2020040006

Name file:
QT 1

Second
First

Third

Fourth

i
Pre-existing faults causing a Check Engine Light must be
evaluated. Reference Pre-Inspection Guide on page 2.

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Emissions Campaign 2020040006

Pre-Inspection Special Procedure

29

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Emissions Campaign 2020040006

30

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Emissions Campaign 2020040006

i
If on-Compliant alterations are found reference the
Pre-Inspection Guide on page 2 for next steps.
31

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32

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11

Emissions Campaign 2020040006

End the DAS session.

Second
First
Third

12

Switch off the ignition.

13

Disconnect the diagnostic system.

14

Disconnect battery charger.
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Emissions Campaign 2020040006

Replacement of AEM Parts
15

Spray penetrating oil
on the threads of the
NOx sensor upstream
of SCR catalytic
converter (3), clamp
(16), clamp (21),
thread of the exhaust
gas temperature
sensor (12) and
clamp (15), as shown.
p
Exhaust system
should be cold in
order to carry out
the next steps. This
avoids injuries.
i
Observe the wait
period and details
provided by the
manufacturer of the
penetrating oil!

Removal of SCR Catalytic Converter

16

The NOx sensor
harness downstream
of the SCR catalytic
converter (5) should
be cut for ease of
removal.
i
The NOx sensor
downstream of the
SCR catalytic
converter (5) is to
remain in the SCR
catalytic converter
and to be returned
together.

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Emissions Campaign 2020040006

17

Loosen the clamp (15) at
tailpipe (13) connection.

18

Lift: Remove tailpipe (13)
from decoupling element
(arrow). Remove tailpipe (13)
from vehicle.

Lift

Ramps: place a rag (arrow B)
between the tailpipe (13) and
the rear axle. Also Place a rag
(arrow A) between the tailpipe
(13) and the floor. Lay tailpipe
on the floor.

19

Remove and dispose the
clamp (15).
i
Observe state-specific
regulations for disposal.

Ramps

20

Remove exhaust gas temperature sensor (12) upstream of
the SCR catalytic converter.
i
This is done by unscrewing the union nut on the exhaust gas
temperature sensor (12) in a counter-clockwise direction.
Position the exhaust gas temperature sensor (12) outside the
working area.

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Emissions Campaign 2020040006

21

Remove the screw on the clamp (16 of
the AdBlue® injection nozzle (17).

22

Remove and dispose clamp (16) at
injection nozzle with a suitable tool and
position the AdBlue® injection nozzle (17)
outside the working area.
i
Observe state-specific regulations for
disposal.

23

Remove and dispose the profile seal (18)
on the AdBlue® injection nozzle (17).
i
Observe state-specific regulations for
disposal.

36

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Emissions Campaign 2020040006

Remove and dispose the spring washer (14)
on the holding bracket of the SCR catalytic
converter (4).

26

i
To do this, remove the SCR catalytic
converter (4) from the decoupling
elements (20).

i
This is done by bending up the individual
locking fins with a screwdriver.
i
Observe state-specific regulations for
disposal.
25

Loosen the clamp (21) between the flex pipe
and the SCR catalytic converter (4).

Removal of Upstream NOx Sensor

28

Disconnect the electrical plug connection
(24) NOx sensor control unit upstream of
the SCR catalytic converter (23).

Remove the SCR catalytic converter (4).

i
Return the SCR catalytic converter (4)
to the originating parts department.
27

Remove and dispose the clamp (21).
i
Observe state-specific regulations for
disposal.

i
To do this, unlock the gray retaining
tab (24.1) by moving towards the cable
harness.
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Emissions Campaign 2020040006

29

Remove the NOx sensor control unit upstream of the SCR
catalytic converter (23) from the frame.

i
To do this, remove and dispose nuts (23.1).

30

Remove and dispose the remaining cable ties and retaining
clips (arrows) from harness (22) of the NOx sensor control
unit upstream of the SCR catalytic converter (23).

i
Observe state-specific regulations for disposal.

31

Remove NOx sensor upstream of SCR catalytic converter (3).
i
The control unit for the NOx sensor and the NOx sensor
upstream of the SCR catalytic converter (3) are a single unit.
i
Return the NOx sensor upstream of SCR catalytic converter
(3) to the originating parts department.

32

Clean the threads and the contact surfaces on the exhaust
pipe.

Removal of Downstream NOx Sensor

33

Remove the heat shield (25).
i
This is done by bending up the individual
locking fins with a screwdriver and
unscrew the clamping nuts (26) in a
counter-clockwise direction with a
screwdriver.

34

Dispose the clamping nuts (26).
i
Observe state-specific regulations for disposal.

38

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Emissions Campaign 2020040006

Disconnect the electrical plug connection
(30) at the downstream NOx sensor
control unit (27).
i
To do this unlock the gray retaining tab
(29) by moving in the direction of the
arrow.

36

Remove the downstream NOx sensor control
unit (27).
i
To do this, remove and dispose the nut
fasteners (28) and cable ties (31).
i
Return the downstream NOx sensor control
unit (27) to the originating parts department.

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Emissions Campaign 2020040006

Installation of Upstream NOx Sensor
i
Completely remove the adhesive labels that are on the
new exhaust system and its components and leave no
residue.

37

Install new NOx sensor upstream of SCR
catalytic converter (3).

39

i
Push the gray retaining tab (24.1) in
the direction of the arrow to lock.

i
A 000 905 85 11 80 (included in
package A 642 905 20 00 85)
NOx sensor upstream of SCR catalytic
converter. Torque to: 60 Nm / 44.3 ft·lb
38

Install the NOx sensor control unit
upstream of the SCR catalytic converter
(23) on the frame.

Connect the electrical plug connection
(24) and lock the retaining tab (24.1).

40

Secure the harness (22) with cable ties
(arrows), as shown.
i
A 000 995 90 06 (1x)
A 007 997 56 90 (2x)

i
Use new fasteners (23.1)
N 000000 003477
NOx sensor control unit. Torque to:
9 Nm / 6.6 ft·lb

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Emissions Campaign 2020040006

Installation of SCR Catalytic Converter
41

Install a new profile seal (18) on the
AdBlue® injection nozzle (17).
i
Clean the sealing surface of the
AdBlue® injection nozzle (17)
before installation. If excess
crystallization of AdBlue® is
present, use water and a nonabrasive cloth to clean the
AdBlue® injection nozzle (17).
i
A 207 492 00 00

42

Position the new clamp (21) on the
exhaust pipe.

44

i
Screw connection point needs to be
pointed downward.
Clamp diesel particle filter on SCR
catalytic converter. Torque to:
35 Nm / 25.8 ft·lb

i
A 000 490 13 41
43

Install new SCR catalytic converter (4).
i
Make sure that the SCR catalytic
converter is correctly seated in the
decoupling elements (20).
i
A 906 490 36 00 80

Tighten the new clamp (21).

45

Install new spring nut (14) on the
holding bracket of SCR catalytic
converter (4).
i
A 123 994 13 45
41

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46

Emissions Campaign 2020040006

Install the AdBlue® injection nozzle (17).
i
Position the new profile clamp (16) on the
SCR catalytic converter (4) first.
i
A 000 995 11 33
i