2023-2026 Audi Shock Absorber Leaks Assessment TSB

Symptoms of an Oily Deposit

Owners of 2023-2026 Audi vehicles may notice an oily deposit on one or more shock absorbers. This observation often leads to concern about a potential Audi shock absorber leak. However, the presence of oil marks does not always indicate a fault requiring repair.

Distinguishing a Real Leak from Normal Oil Marks

Audi TSB 40 25 90 2018194/11 serves as an assessment aid to help technicians determine if a shock absorber is genuinely leaking. A true Audi shock absorber leak is characterized by a distinct wet film of oil actively running down the shock absorber's tube, as depicted in Figures 1 and 2 of the bulletin. This visible wetness is a clear sign that the internal hydraulic fluid is escaping and indicates a need for further action.

In contrast, a light film of dried oil or minor oil marks found on the tube beneath the dust guard is typically not a clear indicator of a leaking shock. These marks, illustrated in Figures 3 and 4 of the TSB, can result from residue left over from the original installation process or from normal "sweating" of the shock absorber near its seal. This small amount of oil is essential for lubrication and helps reduce wear on the seal. If only these minor oil marks are present, it does not negatively affect the technical properties of the shock absorber, and "Replacing the part is not necessary."

Important Warnings for Owners and Technicians

It is crucial to understand that if your Audi shock absorber shows only minor oil marks or sweating, "Replacing the part is not necessary." This TSB explicitly states that such conditions are not indicative of a fault and do not warrant a replacement. For warranty claims, Audi requires strict documentation: all shock absorbers replaced under warranty must be documented with a picture and uploaded to DOC-IT with the VIN before removal. This stringent requirement ensures that only truly defective parts are replaced. If parts are replaced without a good reason, meaning without clear evidence of a leak as defined by the TSB, they will be charged back to the servicing dealer. This policy protects against unnecessary repairs and associated costs. Furthermore, this TSB is informational only and is not applicable to any Audi Warranty as a direct claim.

TSB Details and Revisions

This Technical Service Bulletin, identified as 40 25 90 2018194/11, was issued on January 15, 2025. It supersedes a previous bulletin, Group 40 number 22-34, which was dated March 15, 2022. The TSB has undergone several revisions to update header data and service information, including adding model years. The information contained within this TSB (2018194) is subject to change. While the TSB itself references "All Audi Vehicles 2019 - 2025," the NHTSA data for this document specifically links to 2023-2026 model years.

Owner Action

If you observe an oily deposit on your Audi's shock absorbers, it is recommended to have a qualified Audi technician inspect the vehicle. They will use the guidelines provided in TSB 40 25 90 2018194/11 to accurately assess whether you have a genuine Audi shock absorber leak or simply normal oil residue. This assessment will prevent unnecessary part replacements. For additional information, technicians may refer to the "Checking Shock absorbers" section in the Elsa Repair Manual.

Source: NHTSA ID: 11013716, TSB 40 25 90 2018194/11