A21162320349993

Technical Service Bulletin
Audi
21 Miscolored pipe on turbocharger
21 16 23 2034999/3 August 2, 2016. Supersedes Technical Service Bulletin Group 21 number 14-19 dated
October 16, 2014 for reasons listed below.
Model(s)
Year
VIN Range
Vehicle-Specific Equipment
S6, S7, RS 7,
AS, S8
2013- 2017
All
4.0T
Condition
REVISION HISTORY
Revision
Date
Purpose
3
-
Revised header data (Added model years)
2
10/16/2014
Revised header data (Added applicable engines)
1
8/16/2013
Initial publication
On 4.01 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.
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.
Page 1 of2
© 2016 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 arc 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
Audi
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.
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 service manuals for the latest information.
Page 2 of2
© 2016 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 arc 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.