2021-2026 Audi Front End Noises TSB 2047920/11

Owners of 2021-2026 Audi vehicles may experience various unsettling noises emanating from the front end or dash panel. These sounds, described as buzzing, booming, humming, or whistling, are addressed in Audi Technical Service Bulletin (TSB) 2047920/11. This bulletin helps technicians diagnose and resolve these issues, which are frequently linked to the front wheel bearings.

Symptoms

Customers report a range of noises from the front end of their vehicle. These can include:

• Buzzing
• Booming
• Humming
• Whistling

These noises may be heard specifically around the steering wheel or from behind the dash panel. Owners might initially mistake these sounds for typical tire rolling noises, making diagnosis challenging. If you notice any of these Audi e-tron front end noises, it's important to have your vehicle inspected.

Diagnosis / Trigger Conditions

To accurately pinpoint the source of these noises, technicians follow a specific diagnostic process. This involves evaluating how the noise changes under different conditions:

• Does the noise frequency increase as vehicle speed rises?
• Does the noise become louder when steering?
• Does the noise persist when rolling to a stop in Neutral (N)?
• Is the noise amplified on the steering wheel or airbag well?
• Can vibrations be felt on the coil spring when the wheel is turning with the vehicle suspension extended?
• Does the noise shift to the other side if the wheel bearings are swapped?

Technicians are advised to use acoustic testers such as the PICO tool, Chassis ear, or VAG 1842 to precisely locate the noise source. It's important to note that a noise perceived on one side of the vehicle could originate from a wheel bearing on the opposite side.

Important Warnings

Audi's TSB 2047920/11 includes a critical instruction for repairs:

• The front wheel bearings should not be replaced in pairs.

This guidance helps prevent unnecessary replacements and ensures that only the affected component is addressed. If the noise cannot be traced to a wheel bearing, further analysis on other components is required.

Repair Procedure Summary

The core of the repair procedure involves identifying and replacing the mechanically damaged front axle wheel bearing. Technicians will perform measurements at various points to accurately locate the noise. Once the source is confirmed as a wheel bearing, the specific affected bearing is replaced.

For certain models like the A3, Q3, Q4 e-tron, and TT, specific labor operations (4067 19XX for single wheel hub, 4067 20XX for two wheel hubs) are used. For all other models, labor operations 4057 55XX (single wheel bearing) and 4057 56XX (two wheel bearings) apply. Road tests are performed both before and after the service procedure to confirm the repair.

Required Tools or Parts

Accurate diagnosis often requires specialized acoustic testing equipment. Technicians may use:

• PICO tool
• Chassis ear
• VAG 1842

When billing for parts, the part number of the removed wheel bearing must be billed in SAGA, not the part number from ETKA. These tools and billing procedures ensure proper repair and documentation for any Audi e-tron front end noises.

Warranty Information

This Technical Service Bulletin is informational only if the vehicle is outside of its warranty period. For in-warranty repairs, claims must adhere to the Audi Warranty Policies and Procedures Manual. The Service Number for this issue is 4057, and the Damage Code is 0020. All warranty claims are subject to review and audit by Audi Warranty.

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Source: NHTSA ID: 11013694