News Channel Update |

Vehicle Compliance & Analysis

TO: Mercedes-Benz Dealer Principals, General Managers, FROM: Gregory Gunther, Department Manager, Vehicle
Sales Managers, Service Managers, Parts Managers
Compliance and Analysis, Engineering Services
RE: Service Campaign Launch Notification
Check Front Diffuser Attachment Point Seal
DATE: April 28, 2023
MY21 GT Black Series (190 platform)

IMPORTANT SERVICE CAMPAIGN LAUNCH

Please note that all customer inquiries should be directed to the Customer Assistance Center at 1-800-FORMERCEDES (1-800-367-6372).

Sincerely,
Gregory Gunther
Department Manager, Vehicle Compliance & Analysis

Mercedes-Benz USA, LLC
One Mercedes-Benz Drive

A Mercedes-Benz Group AG Company

Sandy Springs, GA 30328

770.705.0600

News Channel Update |

Vehicle Compliance & Analysis

Service Campaign Launch Notification
Campaign No. :

Campaign Desc. :

2023030016

22P8891008

April 28, 2023

Check Front Diffuser Attachment Point Seal

This is to notify you of the Service Campaign Launch to check the front diffuser on 379 Model Year (“MY”) 2021 GT Black
Series (190 platform) vehicles. The vehicles will be visible and flagged in VMI as “OPEN” on April 28, 2023.

Background
Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz vehicles, has
determined that on certain MY 2021 GT (190 platform) vehicles, the front diffuser
may not meet current production specifications.

Issue

What We’re Doing

MBUSA will conduct a service campaign. An authorized Mercedes-Benz dealership
will check the front diffuser attachment point seals and replace or repair as
necessary.

Parts

The remedy is available and can be performed as necessary.

Vehicles Affected
2021
GT Black Series

Vehicle Model Year(s)
Vehicle Model

Vehicle Populations
Total Campaign Population

379

Next Steps/Notes
AOMS/SOMS

AOMs – This campaign may generate questions from your dealers.

While we regret any inconvenience this may cause, MBUSA is determined to maintain a high level of vehicle quality and customer
satisfaction. Please refer all customer inquiries to the Customer Assistance Center at 1-800-FOR-MERCEDES.

Mercedes-Benz USA, LLC
One Mercedes-Benz Drive

A Mercedes-Benz Group AG Company

Sandy Springs, GA 30328

770.705.0600

2

Campaign No. 2023030016, April 2023

TO:

ALL MERCEDES-BENZ CENTERS

SUBJECT:

Model GT (190 platform)
Model Year 2021
Check Front Diffuser Attachment Point Seal

Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz vehicles, has determined that
on certain MY 2021 GT (190 platform) vehicles, the front diffuser may not meet current production
specifications. An authorized Mercedes-Benz dealership will check the front diffuser attachment
point seals and replace or repair as necessary.

Prior to performing this Campaign:


VMI must be checked before performing campaigns to verify that the campaign is required on
a specific vehicle. Always check for any other open campaigns, and perform accordingly.



Please review the entire Campaign bulletin and follow the repair procedure exactly as
described.

Approximately 379 vehicles are affected.
Order No. P-SC-2023030016

2

Check front diffuser, replace or seal if necessary
Check/test procedure A

1. Remove lower front diffuser (A, Figure 1).
For basic data, see AR61.20-P-1105RG.

Figure 1

2. Check the 5 threaded connections (A, Figure 2) of the removed front diffuser for corrosion.

Figure 2

P-SC-2023030016

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Figure 3 → Areas are corroded (not OK)
Figure 4 → Areas are not corroded (OK)

Figure 3 (areas are corroded = not OK)

Figure 4 (areas are not corroded = OK)

a. Areas are corroded (Figure 3): Carry out work procedure A.
b. Areas are not corroded (Figure 4): Carry out Check/test procedure B.

Check/test procedure B
1. Check the removed front diffuser to see whether all 16 (blue aramid pads) are bonded in the marked places (Figure 5).

Figure 5
a. All 16 (aramid pads) are present (Figure 5): Carry out work procedure B.
b. All 16 (aramid pads) are not present (Figures 11 and 12): Perform work procedure B and C.

P-SC-2023030016

4
Work procedure A
1. Replace front diffuser.
For basic data, see AR61.20-P-1105RG.

Work procedure B
1. Clean all 5 attachment points (Figure 2) of the front diffuser with isopropanol and let dry (Figure 6).

Figure 6
2. Fill all 5 attachment points around the decoupling disc with a bead of Teroson (Figures 7 and 8).

Figure 7

Figure 8

P-SC-2023030016

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3. Spread/pull off the Teroson bead to the surface of the decoupling disk (Figure 9).
The Teroson bead must not protrude more than 1.5 mm beyond the disk.
Ensure that there is no Teroson on the screw-mounting surface; clean if necessary.
Let Teroson harden as per specifications.

Figure 9

4. Reinstall front diffuser.
For basic data, see AR61.20-P-1105RG.

5. Assemble in reverse order.

P-SC-2023030016

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Work procedure C
1. Clean the marked attachment points (16 points, Figure 10) of the front diffuser with isopropanol and allow to dry
completely (Figure 11).

Figure 10

Figure 11
2. Center and attach a self-adhesive aramid pad to all 16 attachment points; ensure adhesion by pressing down and all
around the aramid pad using your thumb (Figure 12&13).

Figure 12

Figure 13

3. Assemble in reverse order.
P-SC-2023030016

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Primary Parts Information
Qty.

As required*
As required
As required**

Part Name

Front diffuser
LU adhesive sealing disk (aramid pads)
Teroson

Part Number

A 190 520 21 00
A 190 989 00 00
A 000 989 46 06

* The replacement parts must be determined according to the equipment variant for the vehicle identification number via
the parts process in the Xentry Portal.
** 1 packaging unit must be used for approx. 10 vehicles and has to be claimed as quantity 0.1
Small parts such as screws, lock nuts, sealing rings, cable ties, fluids, sealant, etc. are not listed in the parts list. The
required small parts are taken into account in the budgeting.
__________________________________________________________________________________________________
Note: The following allowable labor operation should be used when submitting a warranty claim for this repair:
Warranty Information
Damage

Operation

Code

Number

02-0248

02-0249
88 910 08

02-0250

02-0251

Description

Check front diffuser
Check/test procedures A and B
Includes: Remove front diffuser and check for corrosion, and check all 16
points (blue aramid pads)
Replace front diffuser (after check)
Work procedure A
Seal front diffuser (after check) Work procedure B
All 16 aramid pads are present
Includes: Clean 5 attachment points on front diffuser and seal with Teroson
Rework front diffuser (after check)
Work procedures B and C
All 16 aramid pads are not present
Includes: Clean 5 attachment points on front diffuser and seal with Teroson,
and clean 16 attachment points on front diffuser and install aramid pads

Labor Time
(hrs.)

0.4

0.7
0.2

0.9

Note: Always check Xentry Operation Time (XOT) for the current OP-Code times. Labor times are subject to change
and updates may not be reflected in this document.

P-SC-2023030016