26 Noises are heard from the exhaust system at idle speed
26 20 39 2058998/1 March 24, 2020.
Model(s)

Year

VIN Range

Vehicle-Specific Equipment

RS4, RS5

2018 - 2019

All

Not Applicable

Condition
Customer states:
 Noises can be heard from the exhaust system.
Workshop findings:
 A rattling, twittering or bubbling noises can be attributed to the exhaust flap in the rear silencer – mainly
audible at idle speed and with closed exhaust flap. The noise can be changed or located by touching the
exhaust flap or the exhaust flap mounting.
The following DTCs may be stored in the engine control module (ECM), J623 (address word 0001) related to the
exhaust flap:
 DTC P047600 or DTC P04A000 (exhaust flap 1/2, control difference).
 DTC P048C00 or DTC P301B00 (sender for exhaust flap 1/2, implausible signal).

Technical Background
The bearing free play of the exhaust flap mechanism can be affected during operation by environmental
conditions, which is why there can be noise concerns from the exhaust system, particularly after a cold start.

Production Solution
An optimized rear silencer was developed and put into production. Some vehicles are already fitted with the
optimized rear silencer (factory-fitted, with claw coupling and spring lock), but still have an old control motor (part
number 8S0 133 246 A).

Service
1. Evaluate the customer concern with another similar vehicle – If a comparable shifting/working noise of the
control motor and the exhaust flap is found then the concern is normal and no repairs need to be made.

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© 2020 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.

2. If the customer’s vehicle greatly differs from the comparison vehicle in terms of noise generation, then first
check which rear silencer is fitted, making a distinction as follows:
 A. Old version: C-bar (marked yellow) and floating bearing (blue). It is not compatible with an
optimized control motor. The complete rear silencer has to be replaced.

Figure 1. Old rear silencer.
 B. Optimized version: claw coupling (marked yellow) with spring lock (blue). Check which version of the
control motor is fitted: If a new control motor (part number 8S0 133 246 D) has not yet been installed,
replace it individually on the exhaust flap with the concern.

Figure 2. The optimized version of the rear silencer.
Note:
Should there be deviating noise concerns for workshop findings (for example, squeaking), then locate the
cause of concern and deal with it accordingly.
3. Include a recording of the noise in DOC-IT.

Warranty
Claim Type:

 110 up to 48 Months/50,000 Miles.
 If the vehicle is outside any warranty, this Technical Service Bulletin is informational
only.

Page 2 of 4
© 2020 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.

Service Number:

2633

Damage Code:

0020

Labor Operations:

Remove and install 1 rear muffler or 2 rear
mufflers

2633 1900
Or

See SRT

2633 2000
Remove and install 1 exhaust flap or 2
exhaust flaps

2671 1900
Or

See SRT

2671 2000
Diagnostic Time:

Claim Comment:

GFF – Checking and clearing fault codes
included in existing labor operations

0150 0000

Time stated on
the diagnostic
protocol (Max 50
TU)

Road test prior to the service procedure

No allowance

0 TU

Road test after the service procedure

No allowance

0 TU

As per TSB #2058998/1

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

See ETKA

Fasteners, Bolts, Nuts, and Screws as needed per the
Repair Manual

See ETKA/ELSA

See ETKA

Rear Muffler - Right

01

See ETKA

Rear Muffler - Left

01

8S0133246D

Control Motor

01 or 02

Additional Information
All parts and service references provided in this TSB (2058998) are subject to change and/or removal.

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© 2020 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.

©2020 Audi of America, Inc. All rights reserved. The 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.

Page 4 of 4
© 2020 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.