level surface.

3

i
Make sure that there is enough space to
the front.
2

Drive the vehicle onto the ramps until it is
positioned in the end position specified by
the manufacturer of the ramps.
p
Drive the vehicle slowly and at a constant
speed onto the ramps.
Otherwise the vehicle may be damaged.

Place ramps in the middle (arrows A) of
the front wheels.

i
If necessary, include a helper to instruct
you.

i
The ramps must be aligned parallel to
each other.
4

Secure the vehicle against rolling away.
i
For example, by applying the parking
brake and by placing a wheel chock
(arrow B) on the rear wheels.

21

a

Emissions Campaign 2020060003

Initial Quick Test
1
2

Switch off the ignition.
Disconnect Geotab, Omni Track, Navigation
or any aftermarket devices that are connected
to the X11/4 diagnostic socket.

3

Open the hood.

4

Connect the battery charger to the
vehicle's jump posts as indicated.
(arrows)

i
Verify Vehicle Identification Number (VIN)
on vehicle VIN markings matches VIN on
Repair Order exactly. Correct VIN errors
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.

22

a

Emissions Campaign 2020060003

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.

23

a

Emissions Campaign 2020060003

First

Second
Third

24

a

Emissions Campaign 2020060003

wait

25

a

Emissions Campaign 2020060003

26

a

Emissions Campaign 2020060003

wait

27

a

Emissions Campaign 2020060003

Second

First

Name file:
QT 1
Third
Fourth

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

28

a

Emissions Campaign 2020060003

Pre-Inspection Special Procedure

First

Second

29

a

Emissions Campaign 2020060003

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

30

a

11

Emissions Campaign 2020060003

End the XENTRY session.

31

a

Emissions Campaign 2020060003

12

Switch off the ignition.

13

Disconnect the diagnostic system.

14

Disconnect battery charger.

32

a

Emissions Campaign 2020060003

Replacement of AEM Parts

15

Lift:
Raise the vehicle.
i
A description of the lift points is
available on pages 19-20.
Ramps:
Vehicle may remain on ramps.

16

Spray penetrating oil
on the threads of the
NOx sensor upstream
(3) and downstream
(5) of SCR catalytic
converter, 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!

33

a

Emissions Campaign 2020060003

Removal of Upstream NOx Sensor

17

Check whether the NOx sensor control unit
upstream of the SCR catalytic converter (23)
is installed at location

A or B.

i
If the control unit is not installed at location A,
then it must be installed at location B.

i
If the control unit is installed at location
then continue with work steps 18 to 22.

A,

i

If the control unit is installed at location
then continue with work steps 22 to 28.

B,
34

a

i
The work steps 18 to 22 must only be carried out
if the NOx sensor control unit upstream of the
SCR catalytic converter (23) is installed at
location A.

18

19

20

21

Disconnect the electrical plug connection (24)
NOx sensor control unit upstream of the SCR
catalytic converter (23).
Remove the NOx sensor control unit upstream
of the SCR catalytic converter (23) from the
frame.
Remove and dispose the cable ties and
retaining clips (arrows) from harness (22) of the
NOx sensor control unit upstream of the SCR
catalytic converter (23).

A

Emissions Campaign 2020060003

i
To do this, unlock the gray retaining tab (24.1)
by moving towards the cable harness.
i
To do this, remove and dispose nuts (23.1).
i
Observe state-specific regulations for disposal.

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 the SCR
catalytic converter (23) to the originating parts
department.

22

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

35

a

i
The work steps 23 to 29 must only be carried out
if the NOx sensor control unit upstream of the SCR
catalytic converter (23) is installed at location B.

B

Emissions Campaign 2020060003

23

Loosen the heat shield (47).

24

Bend the heat shield (47) down until the NOx
sensor control unit upstream of the SCR catalytic
converter (23) is accessible.

i
This is done by bending up the individual locking
fins with a screwdriver and unscrew the clamping
nut (48) in a counter-clockwise direction with a
screwdriver.

25

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

i
To do this, unlock the gray retaining tab by moving
in the direction of the arrow.

26

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

i
To do this, remove and dispose nuts (46)

27

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

28

Remove NOx sensor upstream (3) of the SCR
catalytic converter.

i
Observe state-specific regulations for disposal.

i
The control unit and the NOx sensor upstream
(3) of the SCR catalytic converter are a single
unit.
i
Return the NOx sensor upstream of SCR catalytic
converter (3) to the originating parts department.
29

Clean the threads and the contact surfaces on the
exhaust pipe.
36

a

Emissions Campaign 2020060003

Removal of Downstream NOx Sensor
i The work steps 30 to 35 must always be carried out

30

31

Remove and dispose mounting
tab (34) from harness (32).
i
Observe state-specific
regulations for disposal.
Remove and dispose of the
clamping nuts (26).
i
This is done by bending up the
individual locking fins with a
screwdriver and unscrew the
clamping nuts (26) in a counterclockwise direction with a
screwdriver.

32

Remove the heat shield (25).

33

Disconnect the electrical plug connection (30) at the NOx
sensor control unit downstream of the SCR catalytic
converter (27).

i
To do this unlock the gray locking device (29)
by moving in the direction of the arrow.

34

Remove the NOx sensor control unit downstream of the
SCR catalytic converter (27).

35

Remove the NOx sensor downstream of the SCR catalytic
converter (5).

i
To do this, remove and dispose the nuts (28)
and cable tie (31).
i
Observe state-specific regulations for disposal.

i
The control unit and the NOx sensor downstream of the
SCR catalytic converter (5) are a single unit.
i
Return the NOx sensor downstream of the SCR catalytic
converter (5) to the originating parts department.
37

a

Emissions Campaign 2020060003

Installation of Upstream NOx Sensor
i
The work steps 36 to 39 must only be carried out
if the NOx sensor control unit upstream of the SCR
catalytic converter (23) was installed at location A.

36

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

A

38

i
A 000 905 81 11 (included in package
A 651 905 11 00 85)
NOx sensor upstream of SCR catalytic
converter. Torque to: 60 Nm / 44.3 ft·lb
37

Install the NOx sensor control unit
upstream of the SCR catalytic converter
(23) on the frame.
i
Use new fasteners (23.1)
N 000000 003477

Connect the electrical plug connection
(24) and lock the retaining tab (24.1).
i
Push the gray retaining tab (24.1) in the
direction of the arrow to lock.

39