2021 Mercedes-Benz AMG GT Front Diffuser Seal Issue

Why This Matters

Mercedes-Benz AG has determined that the front diffuser on certain 2021 GT Black Series (190 platform) vehicles may not comply with current production specifications. This deviation could potentially affect the integrity of the front diffuser attachment points.

What's Being Addressed

This service campaign, identified by campaign numbers 2023030016 and 22P8891008, focuses on the front diffuser attachment point seals. Mercedes-Benz USA (MBUSA) will conduct a service campaign to ensure these components meet the required standards. Approximately 379 vehicles are affected by this campaign.

Repair Procedure Summary

Authorized Mercedes-Benz dealerships will perform a check-and-test procedure on the front diffuser. This involves several steps to inspect and, if necessary, repair or replace the affected components. The process includes:

1. Removal and Inspection: The lower front diffuser is removed. Technicians will clean the threaded connection points with isopropanol and inspect them for corrosion. They will also check for the presence of 16 blue aramid pads.
2. Corrosion Assessment: If metal inserts are severely corroded, a full replacement of the front diffuser upper part (Work Procedure A) is performed. If corrosion is minor or absent, the repair proceeds to sealing.
3. Sealing Procedure (Work Procedure B): For diffusers with minor or no corrosion, technicians will clean the attachment points and apply Teroson bead around the decoupling disks. The Teroson bead must not protrude more than 1.5 mm beyond the disk, and care must be taken to ensure no Teroson is on the screw-on surface.
4. Aramid Pad Installation (Work Procedure C): If the aramid pads are missing, technicians will clean the 16 marked attachment points and affix new self-adhesive aramid pads, pressing them firmly into place.
5. Reassembly: The front diffuser is then reinstalled, and all components are assembled in reverse order of removal.

Required Tools or Parts

To perform the necessary repairs for the Mercedes-Benz AMG GT front diffuser issue, specific parts and materials are required:

• Front diffuser upper part: A 190 520 24 00 (as required for replacement)
• LU adhesive sealing disk (aramid pads): A 190 989 00 00 (as required)
• Teroson: A 000 989 46 06 (as required for sealing)
• Isopropanol: A 005 989 19 71 (as required for cleaning)

Small parts like screws, lock nuts, and cable ties are also accounted for in the budgeting for this repair.

Important Warnings for Owners

• Dealer Verification: Dealerships are instructed to check the Vehicle Master Inquiry (VMI) system to verify if the campaign is required for a specific vehicle before performing any work. They must also check for any other open campaigns.
• Repair Procedure Adherence: Technicians are required to review the entire Campaign bulletin and follow the repair procedure exactly as described.
• Diffuser Rework Preference: A reworking of the front diffuser is preferred where possible. The front diffuser is solely approved with informative images directly via a TIPS case by the Product Support AMG / AMG Aftersales Regulation TEV/OPT.
• Customer Inquiries: All customer inquiries regarding this campaign should be directed to the Customer Assistance Center at 1-800-FOR-MERCEDES (1-800-367-6372).

Owner Action

If you own a 2021 Mercedes-Benz AMG GT Black Series, it is recommended to contact your authorized Mercedes-Benz dealership to schedule an inspection. The dealership will check the front diffuser attachment point seals and perform any necessary repairs or replacements free of charge under this service campaign. The remedy is available and can be performed as necessary.

Warranty Information

Mercedes-Benz has provided specific labor operation codes for this repair, which dealerships will use when submitting warranty claims. These include:

• 02-0248: Check front diffuser, includes removal, cleaning, and inspection of aramid pads (0.6 hrs)
• 02-0249: Partially replace front diffuser (Work Procedure A) (0.9 hrs)
• 02-0250: Seal front diffuser (Work Procedure B), for when all aramid pads are present (0.2 hrs)
• 02-0251: Rework front diffuser (Work Procedures B and C), for when aramid pads are not present (0.9 hrs)
• 02-2186: Create TIPS case (0.2 hrs)

Always check Xentry Operation Time (XOT) for current OP-Code times, as labor times are subject to change.

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Source: NHTSA ID: 11000732