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Technical Service Bulletin Transaction No.: 2072473/2
19 Red Coolant warning lamp comes on; Coolant Leak at Turbocharger Release date: Apr 6, 2026
Condition
Model(s) VIN Range Vehicle Specific Equipment
All V8 TFSI
REVISION HISTORY
revision [one purpose
2 Revised header (Add Model Years, updated control units)
Revised Condition (Added model table)
Revised Service (Updated SVM table)
Revised Warranty (Removed claim types, updated labor operations)
12/21/2023 | Initial publication
Customer states:
There is a coolant leak.
The red coolant level warning lamp lights up in the instrument cluster.
Workshop findings:
A coolant leak is identified at the return lines to the turbocharger (Figure 1).

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Figure 1. Coolant leak at the return lines to the turbocharger.
Technical Background
In some model years, After-Run Coolant Pump (V51) start with a slight delay. This can lead to unintended additional
heat at O-rings at the return connected to the turbochargers.
Production Solution
Not applicable.
Service
+ Replace the O-rings at the coolant return lines at the Turbocharger (refer to Figures 2 and 3 or SSP 920493).
+ Please remove and install the coolant return line according to workshop manual (ELSA) and replace

O-rings on the coolant at the crankcase side (Figure 3).

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Figure 2: Coolant return lines are marked.

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Figure 3: Location of the O-rings.
+ Determine if there is a software update available for the vehicle. Please perform any necessary updates using
the table below if applicable.
1. Follow all instructions in TSB 2011732: 00 Software Version Management (SVM), operating instructions.
2. Update the ECM, -J623- (address word 0001) using the SVM action code as listed in the table below, if
necessary:
Old Soft Old Soft New Software New Software
oftware ortware Part Number Version
Part Number Version SVM Code Input
(or higher) (or higher)
MY19 A& 4N0906014C 0001 4N0906014C 0002
MY20 A8& 4N0906014A 0004 4N0906014A
01A312
MY21 A8& 4N0906014A 0002 4N0906014A 0003
MY20 S8 4N0907557C 0001 4N0907557C. 0002
MY21 S8 4N0907557G 0001 4N0907557G 0002
MY23 S8 4N0907557K 0002 4NO907557K 0004 01A297
MY24 ane MY25 | 4N0907557P 0002 4N0907557P 0004
Warranty

Claim Type: + If the vehicle is outside of any warranty, this Technical Service Bulletin is
informational only.
Damage Code: 0050
Labor Operations: Coolant pipe remove+reinstall 2135 2023 See SRT with
associated operations
GFF (Without update) 0150 0060 Time stated on the
diagnostic protocol
GFF (Software update performed) 0151 0060 Time stated on the
diagnostic protocol
Charge battery 2706 8950 See SRT with
associated operations
Claim Comment: As per TSB 2072473/2
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.
Please note the information on predecessors and items that are included and excluded in the repair operations, as
well as any associated tasks.
Required Parts and Tools
Tool Number Tool Description
VAS 6160/VAS 6150 | VAS tester with the current version of ODIS (Windows 10)
Additional Information
The software must be updated on a control unit in this vehicle, or the software must be updated several control units
in this vehicle to ensure they function correctly in conjunction with the other control units in the vehicle. Please
inform the customer about the software update in question and ask whether they or other third parties have modified
the software (e.g. tuning or retrofitting involving the software of the vehicle. Please inform the customer that this
software update may neutralize previous modifications to the software of the vehicle performed either by the
customer or other third parties.
If the customer declines the software update, please inform them that this could lead to issues or restrictions with
the use of the vehicle or individual components.
Make a note to this effect on the order before it is signed by the customer. Include this information in the customer
file.
All part and service references provided in this TSB (2072473) 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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