Technical Service Bulletin
21 Engine difficult to start, turbocharger is damaged - V8 4.0TFSI
21 24 40 2044640/13 May 31, 2024. Supersedes Technical Service Bulletin Group 21 number 22-39 dated March
3, 2022 for reasons listed below.
Model(s)

Year

S6, S7, A8, and
S8

2013 - 2017

RS 7

2014 - 2017

VIN Range

Vehicle-Specific Equipment

All

4.0L Engine

Condition
REVISION HISTORY
Revision

Date

Purpose

13

-

Revised header (Updated Models)
Revised Service (Updated Note iconography)
Revised Warranty (Updated Claim Type, and Labor Operations)
Revised Required Parts and Tools (Updated Note iconography)

12

03/04/2022

Revised Warranty (Updated Service Number)

11

12/16/2021

Revised attachment
Revised Service (Updated Step 8 and 9)
Revised Warranty (Updated Labor Operations)

Customer states:
• The engine cannot be started or only with difficulty.
• The engine makes unusual noises when accelerating.
• The engine has reduced performance.
Workshop findings:
• Damage on turbocharger impeller fins causes increased free play on the impeller shaft of the turbocharger or
there is a broken impeller shaft.

Technical Background
Damage to the turbocharger is rarely directly the result of turbocharger failure. Therefore, it is important to
perform further checks to find the root cause, to avoid repeat repairs.
Known causes for turbocharger damage:
• Performance increases by tuned ECM.
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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.

Technical Service Bulletin
• Non-compliance with service intervals.
• Incorrectly fitted oil filter element.
• Leaks in the intake tract allowing outside unfiltered air and debris into the turbocharger.
• Poor oil supply to the turbocharger.

If the vehicle has any DTCs related to the turbocharger boost/regulation the complete GFF Test plan
must be completed and repairs performed before determining if further repairs are necessary.

Production Solution
Optimized oil strainer 079115175G for oil supply lines to turbochargers in the cover in the inner valley of
the engine. The oil strainer and check valve 079103175C must always be replaced to ensure proper oil
flow to the turbochargers.

Service
Watch the June Hot Topics before proceeding
with the below repair at: https://audiacademy.kzoplatform.com/player/medium/11
86073779801953796 (Figure 1).

Figure 1. QR Code for supporting video.
1.

Perform the Guided Functions with the diagnosis tester: "01 check warranty information." Then
check for an entry with the vehicle data in Elsa under the warranty key.
• All information must be documented with pictures with the attached Checklist filled out completely
and stored with the Repair Order.

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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.

Technical Service Bulletin
2.

Check the hardware version of the engine
control module. An X version indicates
that the engine control module was
replaced/or is modified (Figure 2).

Figure 2. Correct hardware version number.
Perform a visual check of the engine control module
(check for irregularities of the housing of the control
module) and check whether a tuning box is fitted (also in
the area behind the diagnostic interface).
3.

Check the intake tract for leaks. Review the repair history for possible previous repairs on the intake
tract.

4.

Measure the oil pressure at idle and 2000 rpm according to Elsa.

5.

Visually assess the condition of the damaged turbocharger from both sides. No oil marks (charge air
and exhaust side) could be another indication of poor oil supply to the turbocharger.

6.

Check the oil filter for correct installation and correct filter part number 079115561J. If the oil filter is
not centrally fitted, the engine oil may not be filtered, entering the oil supply of the turbocharger due
to the crooked position of the oil filter element.

7.

Check the installation of the oil filter bypass valve according to service measure 17F2.

This TSB is not replacing any Elsa Repair Manual instructions, this TSB is meant to supplement
the Repair Manual. See Elsa, Engine >> 8-Cylinder Direct Injection 4.0L 4V TFSI Engine >> 21
Turbocharger >> Turbocharger, Removing and Installing.
8.

Replace the turbocharger as well as the oil strainer and check valve in the inner valley of the
engine according to Elsa and observe all instructions, including:
• Check the oil supply line for through flow and oil deposits.
• Check the oil drain hoses for through flow and oil deposits.
• Filling the turbocharger at the supply line connections with engine oil.
• Replacement of the turbocharger wastegate vacuum actuator is no longer necessary. The
vacuum actuator and actuator rod can be reused. The existing clip must not be reused and must
always be replaced. The retaining clip is now available in ETKA.

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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.

Technical Service Bulletin
9.

Change the engine oil including the oil filter. Check the drained oil and oil filter for particles. If
particles are found, flush the engine and new turbocharger with the new engine oil at an increased
engine speed for 15 minutes.
• If no particles were found in the drained engine oil or oil filter, another oil change is not
necessary, and the engine does not have to be flushed at an increased idle speed.
• To ensure the turbocharger is supplied with enough oil, let the engine run at idle for
approximately one minute after starting, do not increase rpm.

Failure to follow the TSB and Elsa instructions may lead to premature turbocharger failure
which may be reviewed by Warranty. Warranty may review the claim and request the
turbocharger that was replaced. Documents and pictures may be requested to be sent to the
Warranty Parts Return Center.

Warranty
Claim Type:

• If the vehicle is outside any warranty, this Technical Service Bulletin is only
informational.

Service Number:

2130

Damage Code:

0010

Labor Operations:

Turbocharger replace (1 or 2)

2130 5671
Or
2130 5571

See SRT with
associated
operations

Oil pressure check

1703 0199

80 TU

Check intake and exhaust system for debris,
additional time is included in Turbocharger
remove + reinstall

2130 0199

20 TU

Remove + reinstall oil strain and check valve

1726 2099

70 TU

Check that the oil bypass valve is fitted
correctly

1701 0199

10 TU

Engine oil and filter change - once

1701 1799

40 TU

1701 1799

100 TU

OR
Engine oil and filter change – twice. Flush oil
circuit

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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.

Technical Service Bulletin
Both Turbochargers remove + reinstall

2130 2071

See SRT with
associated
operations

2130 1971

See SRT with
associated
operations

Right turbocharger remove + reinstall

2130 1972

See SRT with
associated
operations

Air intake distributor remove + reinstall

2446 1921

OR
Left turbocharger remove + reinstall

OR

Or
2446 1971
Or
2446 1923

See SRT with
associated
operations

(RS7 only)

Diagnostic Time:

Night vision Camera System adjustment (if
equipped)

9080 1550

See SRT with
associated
operations

Radar sensor adjustment (if equipped)

9163 1650

See SRT with
associated
operations

Overhead view camera adjust (if equipped)

9083 1550