2021 Audi Models Front Suspension Noise TSB

Owners of various 2021 Audi models may notice an unsettling Audi front suspension noise, specifically rumbling or squeaking sounds emanating from the front end. This issue is addressed by Audi Technical Service Bulletin (TSB) 40 20 13 2059474/2, which supersedes an earlier bulletin, 20-06, dated May 13, 2020. The TSB provides guidance for technicians to diagnose and correct the source of these noises.

Symptoms

The primary symptom reported by vehicle owners is the presence of "Rumbling or squeaking noises from the front end." This Audi front suspension noise can be a persistent and noticeable issue, indicating a problem within the vehicle's suspension system.

Technical Background

Audi has identified that the root cause of the Audi front suspension noise is related to the buffer stops of the shock absorbers. Due to recent improvements in suspension design, the material used for these buffer stops has increased in hardness. This change makes it more difficult for the buffer stops to be correctly pressed into their mountings during assembly, leading to improper seating.

Diagnosis

During workshop inspections, technicians have found that the buffer stops of the shock absorbers are not sitting correctly within their mountings. This improper seating directly causes the rumbling or squeaking noises experienced by drivers. Figure 1 in the original TSB illustrates how the shock absorbers are sitting incorrectly, confirming the visual diagnosis for this Audi front suspension noise.

Repair Procedure Summary

The repair outlined in TSB 40 20 13 2059474/2 involves two main steps to resolve the Audi front suspension noise:

1. Secure Buffer Stops: Technicians must ensure that the buffer stops are correctly and completely pressed into their mountings. A tire assembly paste can be used as an aid to facilitate proper seating.
2. Inspect and Replace if Necessary: If the buffer stops were deformed, potentially during vehicle transport, technicians should attempt to reshape them by warming them up slightly. If reshaping is not possible, the affected components must be replaced to ensure proper function and eliminate the noise.

Required Tools or Parts

To perform the repair, technicians will need to consult ETKA (Electronic Parts Catalogue) and ELSA (Electronic Service Information System) for the latest information on parts and bulletins. Specific items that may be required include:

• Fasteners, Bolts, Nuts, and Screws: As needed per the repair manual.
• Buffer Stop: If replacement is necessary, one or two buffer stops may be required.

Warranty Information

This repair is covered under Audi's warranty for up to 48 months or 50,000 miles, whichever comes first. The Service Number associated with this bulletin is 4098, and the Damage Code is 0020. Various labor operations are specified for warranty claims, including:

• Buffer stop remove + reinstall (Labor Operations 4098 1950 or 4088 1950, and 4098 2050 or 4088 2050).
• Securing one front axle buffer stop (Labor Operation 4098 1399, 30 Time Units).
• Securing two front axle buffer stops (Labor Operation 4098 1499, 50 Time Units).
• Road tests prior to and after the service procedure (Labor Operations 0121 0002 and 0121 0004, each 10 Time Units).

Important Warnings

It is crucial for owners to understand that if their vehicle is outside the specified warranty period (48 months/50,000 miles), this Technical Service Bulletin 40 20 13 2059474/2 is for informational purposes only. In such cases, the cost of diagnosis and repair would typically be the owner's responsibility. All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual.

Source: NHTSA ID 10177884