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Technical Service Bulletin Transaction No.: 2074846/4
44 Vibrations and rotational steering wheel vibrations Release date: Jan 13, 2026
Condition
Model(s) Year(s) VIN Range Vehicle Specific Equipment
All Audi vehicles | 2000 — 2026 All Not applicable

REVISION HISTORY

Revision | Date Purpose

4 - Revised Condition (Added model table)
Revised Warranty (Updated Labor Operations)

3 10/17/2025 | Revised header (Update Model Year)
Revised Warranty (Updated Labor Operations)

2 09/18/2024 | Revised Warranty (Updated Labor Operations)

Customer states:

Vibrations at 35 - 70 mph (60 — 150 km/h). Vehicle occupants may notice the vibrations in the seat surface, the
vehicle floor, the footwell, the pedal cluster or the steering wheel. The vibrations may be stronger when braking or
accelerating or only occur in these phases.

Technical Background
¢ Radial force variation:

Due to the characteristics of their construction and production, tires have softer and stiffer areas in radial direction
around their circumference. The change to the tire’s compression force is referred to as radial force variation. To
measure the radial force variation, the tire is turned while a constant force is applied to it using the counter pressure
roller of vibration control system VAS6230(A). This simulates the rolling of the tire on the road surface. The variation
of the radial force does not depend on the direction of rotation and is measured as the difference between the
maximum and minimum radial force (peak to peak value). The peak-to-peak value must be 120N or less.

The first harmonic vibration is the part of the radial force variation which causes the strongest vibrations. It must be
80N or less.

* Flat spots caused by storage:

Even after a short stationary period (a few hours) flat spots develop after the warm tire has cooled down. This is
more, or less pronounced depending on the type, dimension and make of the tire. Flat spots falsify the radial force
variation measurement. It is very important to drive them out prior to every wheel balancing procedure.

Flat spots are normal and not faults covered under warranty.
Please also note the information on flat spots in the Workshop Manual > Wheels and tires/Flat spots caused
by storage or handling.

Production Solution
100% wheel balancing from week 01/2008.

Service

Please complete the following steps in the specified order:

1. Perform a test drive of up to 20 miles in various speed ranges (up to 65 mph).

2. Raise the vehicle immediately after the test drive so that the wheels are off the ground.
3. After removing the wheels, mount them on the vibration control system VAS6230(A).
4

Measure, balance and (if necessary) match the wheel according to the instructions given by the equipment.
Use the above reference values to do so.

5. Fit the wheels on the vehicle according to the instructions given by the Hunter equipment.
6. Restore the tire pressure required for the vehicle.

7. Assess the vehicle in the speed range where the complaints occurred.

If the first harmonic vibration of the radial force cannot be brought to the specified limit of 80N by
matching, a new tire must be used.

When tightening the wheel on the vibration control system, make sure that the flange and wheel contact
surfaces are clean, that the wheel is correctly centered and that a suitable taper and tensioning device is
used. We recommend the use of a five-finger tensioning device.

Warranty
Claim Type: * If the vehicle is outside of any warranty, this Technical Service Bulletin is
informational only.
Service Number: 4440
Damage Code: 0013
Labor Operations: 1 wheel balanced 4405 9300 See SRT with
associated operations
1 wheel matched 4405 9351 See SRT with
associated operations
2/3/4 wheels balanced 4405 940x See SRT with
associated operations
2/3/4 wheels matched 4405 945x See SRT with
associated operations
GFF No allowance OTU
Road test prior to the service procedure 0121 0002 10 TU

Road test after the service procedure 0121 0004 10 TU

Claim Comment: As per TSB 2074846/4

All warranty claims submitted for payment must be in accordance with the Audi Warranty Policies and Procedures
Manual. Claims are subject to review or audit by Audi Warranty.

Only repairs on components which were part of the vehicle when it was delivered can be claimed under
warranty.

The VAS6230 logs for each wheel and the information sheets (as described above) must be marked with the VIN
number and attached to the warranty claim.

Required Parts and Tools

Tool Number Tool Description

VAS 6230 (GSP9700) | Road Force Measurement System

VAS 6243 Clamping Plate

Additional Information

All part and service references provided in this TSB (2074846) are subject to change and/or removal. Always check
with your Parts Department and/or ETKA for the latest information and parts bulletins. Please check the Repair
Manual for fasteners, bolts, nuts, and screws that require replacement during the repair.

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