Discolored Pipe on Turbocharger – 2013-2018 Audi

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© 2019 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
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21 Discolored pipe on turbocharger
21 19 32 2034999/4 June 21, 2019. Supersedes Technical Service Bulletin Group 21 number 16-23 dated August 2, 2016 for reasons listed below.
Model(s)
Year
VIN Range
Vehicle-Specific Equipment
S6, S7, S8, RS 7, and A8
2013 – 2018
All
4.0T
Condition
REVISION HISTORY
Revision
Date
Purpose
4
–
Revised title
Revised header (Added model year)
3
08/09/2016
Revised header (Added model years)
2
10/16/2014
Revised header data (Added applicable engines)
On 4.0l bi-turbo FSI engines, the pipe on the impeller side of the bank 2 turbocharger looks discolored when compared to the pipe on the bank 1 turbocharger.
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© 2019 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.
Technical Background
The crankcase breather
is only connected to the
bank 2 turbocharger
inlet. Blow-by gases
from the crankcase
breather discolor the
pipe (Figure 1). This is
a normal condition.
Figure 1. The pipe on the impeller side of the bank 2 turbocharger is discolored due to
blow-by gases from the crankcase breather.
Production Solution
Not applicable.
Service
1. If necessary, explain to the customer that this is a normal condition.
2. Do not replace any parts due to this condition.
Warranty
This TSB is informational only and is not applicable to any Audi Warranty.
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© 2019 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.
Additional Information
All parts and service references provided in this TSB (2034999) 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.
©2019 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.

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