2021-2024 Audi A3/S3/RS3 Front End Cracking Noise TSB

Owners of certain 2021-2024 Audi A3, S3, RS 3, A3 Sportback e-tron, A3 Cabriolet, and Q3 models may experience an Audi S3 cracking noise emanating from the front end, particularly when changing direction. This issue is addressed by Audi Technical Service Bulletin (TSB) 2061464/5, which supersedes previous bulletin 23-55 dated May 9, 2023. This TSB provides a detailed repair procedure to resolve the concern.

The TSB, identified as Service Number 4045, outlines a specific fix for the cracking noise, which is attributed to relative movement within the drive axle and wheel bearings. Audi has gradually introduced improved drive axles in production to mitigate this issue in newer vehicles.

Symptoms

Owners typically notice a distinct cracking noise from the front end of their vehicle. This noise is most apparent when changing direction, such as turning or maneuvering at low speeds. Workshop findings confirm that this is often a "one-off cracking noise from the front after changing direction" when pulling away.

Diagnosis / Trigger Conditions

The root cause of the Audi S3 cracking noise is identified as relative movement of the drive axle within the wheel bearings. This movement creates the audible cracking sound. Technicians can reproduce the condition by pulling away after changing direction.

Important Warnings

Following the repair procedure, it is crucial to observe a specific waiting period. Audi states: "After assembling the drive axle(s), the vehicle must not be operated for 8 hours." This allows the applied locking fluid to properly cure and ensure the repair's effectiveness and safety.

Repair Procedure Summary

The repair detailed in TSB 2061464/5 involves a precise application of liquid locking fluid to the drive axle. The general steps include:

1. Disassembly: The affected drive axle must be disassembled. Technicians are instructed to follow the specific guidelines provided in the ELSA Repair Manual, under Chassis >> Suspension, Wheels, Steering >> 40 Front Suspension >> Front Axle >> Drive Axle Disassembling, Assembling.
2. Fluid Application: Liquid locking fluid is then applied to the threaded connection of the drive axle. Visual aids in the TSB (Figure 1) show the exact areas for application.
3. Reinstallation: The drive axle is then reinstalled, again following the detailed instructions in the ELSA manual.

This procedure, with Damage Code 0010, aims to eliminate the relative movement causing the cracking noise.

Required Parts and Tools

To perform this repair, specific parts and tools are necessary:

• Locking Fluid: Part number D 154100A1, with a quantity of 0.2 units required.
• Fasteners: Fasteners, bolts, nuts, and screws as needed, which should be referenced in ETKA and the ELSA Repair Manual.
• ELSA Repair Manual: Essential for detailed disassembly and reassembly instructions.

Warranty Information

This repair is covered under Audi's warranty for up to 48 months or 50,000 miles, whichever comes first (Claim Type 110). For Certified Pre-Owned (CPO) vehicles, coverage falls under Claim Type G10, subject to owner verification. If the vehicle is outside of its warranty period, this Technical Service Bulletin serves as informational guidance only.

Labor Operations

The TSB specifies several labor operations and associated time units (TU):

• Bond in 1 outer driveshaft (Labor Operation 4041 4999): 90 TU. This includes removing and installing one wheel, noise insulation, and detaching/re-attaching a suspension link.
• Bond in 2 outer driveshafts (Labor Operation 4041 5099): 120 TU. This includes removing and installing two wheels, noise insulation, and detaching/re-attaching two suspension links.
• Diagnostic Time (GFF): No allowance.
• Road test prior to service (Labor Operation 0121 0002): 10 TU.
• Road test after service (Labor Operation 0121 0004): 10 TU.

All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual, with claims subject to review or audit by Audi Warranty, as per TSB 2061464/5.

Source: NHTSA ID 10238314