ZN Connection offline

Technical Service Bulletin

34 Oil leak near the transmission cooler

Transaction No.: 2067365/3
Release date: Jan 5, 2026

Condition
Model(s) Year(s) VIN Range Vehicle Specific Equipment
2017 — 2020
A3
2022 — 2023
A3 Cabriolet 2017 — 2019
All DQ-381 Transmission
2018 — 2020
$3
2022 — 2023
TT, TTS, and TT Roadster] 2019-2023
REVISION HISTORY
Revision Date Purpose
3 - Revised Condition (Added model table, documentation note)
Revised Warranty (Updated labor operation)
2 11/15/2022 | Revised Warranty (Updated labor operation)
1 07/11/2022 | Initial publication
Customer states:

An oil leak is noticed under the front of the vehicle.

Workshop findings:

The oil leak traced to the area near the transmission oil cooler at the seam of the case (Figure 1).
Figure 1. Oil leak at transmission case seam.

Technical Background
Not applicable.

Production Solution
Not applicable.

Service

Documentation required
Clean the transmission and oil cooler area thoroughly in the affected area using suitable workshop materials.
Dry the area of the leak with rags and/or compressed air.

Using oil leak detection spray (part number: G 001 900 A1 or equivalent powder-based oil leak detector) on
the affected area on gearbox housing.

Perform a short road test to warm up the gearbox (engine oil temperature at least 80°C) and assess the leak
again (refer to Figure 1, red oval).

©

Please upload photo documentation of the leak to Doc-IT

If the leak cannot be traced to the areas below the gear oil cooler/separating joint, this TSB does not apply.
Continue diagnosis of the oil leak without claiming this TSB.

If the leak can be clearly traced to the area below the gear oil cooler at the separating joint, you must
document your findings with photos that clearly show the leak. Keep the documentation photos with the
warranty records of the repair.

Repair the affected area as described below:

Audi A3 vehicles: Remove the 12-volt volt battery and battery tray as specified in Workshop Manual. Audi TT
models with a 12-volt volt battery mounted in the trunk do not need the battery removed.

Remove bolt for housing (Figure 2, red circle). Then check if there is a film of oil in the hole (using a mirror and
flashlight) and on the threads of the removed bolt.

If there is no film of oil in the hole and/or on the bolt for housing, the gearbox must be replaced according to
the repair manual (Repair option 2 in the Warranty table).

If there is a film of oil in the hole and/or on the bolt for housing, replace the bolt with a new bolt for the housing
(part number: N 107 443 04). Tighten bolt for housing (Figure 3) to a torque of 20 Nm + 90° (Repair option 1 in
the Warranty table).

If necessary: Install battery and battery tray (if previously removed) as specified in Workshop Manual.

Figure 3. Tightening housing bolt to a torque of 20 Nm + 90°.
* Check gear oil level as specified in Workshop Manual.

— _ If necessary, top up gear oil as specified in Workshop Manual.

* Perform a short test drive to warm up the gearbox (engine oil temperature at least 80 °C).

* After a waiting time of at least 1 hour, assess the gearbox housing again:

— If the gearbox housing is free of leaks, no further work is required. The vehicle can be returned to the

customer.

Warranty

The labor times correspond to the specified times in the repair operations list at the time of the pulicatio of this TSB.
There may be differences if the repair operations list has been updated in the meantime. If this is the case, the
current time specification in the regular repair operations list apply Times to be entered manuall (... 00) are expempt

from this.

Claim Type:

* — If the vehicle is outside of any warranty, this Technical Service Bulletin is

informational only.

Service Number:

3435

Damage Code:

0050

Labor Operations:

Diagnosis of leak (Repair options 1 and 2):

Remove and install battery tray 5084 19xx See SRT with
associated operations

Check transmission unit (Including 2x removing 3435 0199 40 TU

and installing battery try and cleaning gearbox)

Road test prior to service procedure 0121 0002 10 TU

Road test after service procedure 0121 0004 10 TU

If necessary:

Repair option 1:

Remove and install pressure pipe 2141 19xx See SRT with
associated operations

Service gearbox (including cleaning gearbox) 3435 4199 10 TU

Check and top off gear oil 3401 3599 20 TU

Repair option 2:

Replace transmission 3435 55xx See SRT with

associated operations

Claim Comment:

As per TSB 2067365/3

Please note the information on predecessors and items that are included and excluded in the repair operations, as
well as any associated tasks.

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.

Required Parts and Tools

Always check with your Parts Department and/or ETKA for the latest information and parts bulletins.

Part Number Part Description Quantity
G 001 900 A1 Oil leak locating spray Shop supply
(or equivalent) (or equivalent leak detection powder)
N 107 443 04 Pan head bolt w/ multi-point drive, self-locking (Repair 01
Option 1 Only)

Additional Information

All parts and service references provided in this TSB (2067365) are subject to change and/or removal.

©2025 Audi of America, Inc. All rights reserved. Information contained in this document is based on the latest
information available at the time of printing and is subject to the copyright and other intellectual property rights of
Audi of America, Inc., its affiliated companies, and its licensors. All rights are reserved to make changes at any time
without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form
or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be
modified or reposted to other sites without the prior expressed written permission of the publisher.