A011369 2028344-

Technical Service Bulletin
01 Idle speed characteristic during cold start
01 13 69 2028344/4 February 14, 2013. Supersedes Technical Service Bulletin Group 01 number 12-57 dated
October 29, 2012 for reasons listed below.
Model(s)
Year
Cabrio
2007-09
Engine BKH
A4
2005-09
Engine BKH
A6
2005-09
Engine BKH
S5
2008-12
Engine CAUA
S6
2007-11
Engine BXA
S8
2007-09
Engine BSM
R8 V8
2008-10
Engine BYH
R8 V8
2011-13
R8 V10
2009-13
Engine BUJ
R8 V10
2012-13
Engine CMPA
RS 5
2013-2014
Engine CFSA
S6
2013-2015
Engine CEUC
S7
2013-2015
Engine CEUC
S8
2013-2015
Engine CGTA
A8 4.0T
2013-2015
Engine CEUA
© 2013 Audi of America, Inc.
VIN Range
All
Vehicle-Specific Equipment
Engine CNDA
Page 1 of 3
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
Condition
REVISION HISTORY
Revision
Date
Purpose
4
-
Revised header data (RS 5 Cabriolet added)
3
10/25/12
Revised header data (New models added)
2
7/18/12
Revised header data
1
1/13/2012
Original publication
• Noises/inconsistent engine operation after cold start during the catalyst heating phase.
• The customer may interpret this engine roughness as misfiring.
Technical Background
To comply with the legal requirements on exhaust gas emissions according to the LEV-1 and LEV-2 standards, a
high exhaust gas quality must be ensured. The necessary catalyst only operates at a temperature over 300°C
(572°F). To achieve this, the catalyst is heated up. The catalyst heating phase is achieved by a late ignition angles
and by introducing additional fresh air to the exhaust valves (secondary air system).
Late ignition angles make sure that the exhaust gas from the cylinders has a higher temperature. This exhaust gas
includes fuel that is un-burnt, and was deliberately injected into great quantities. The secondary air system adds
fresh air to the exhaust gas as it leaves the cylinder and the extra fuel is burnt. As a result, the temperatures of the
exhaust gas and of the catalyst increase quickly.
Effects:
The afterburning in the exhaust manifold before the catalyst changes the sound characteristic of the engine. This
heating-up of the catalyst, including afterburning, is normal and has no effect on the service life of the engine.
During this catalyst heating phase, the engine has increased idle speed, may have increased vibrations, and has a
different sound characteristic.
Conditions for the catalyst heating phase:
Depending on conditions, the time of the catalyst heating phase varies.
Production Solution
No change
© 2013 Audi of America, Inc.
Page 2 of 3
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
Service
Please do not repair. Explain the technical background to the customer.
Warranty
This TSB is informational only and not applicable to any Audi warranty.
Additional Information
All parts and service references provided in this TSB are subject to change and/or removal. Always check with
your Parts Department and service manuals for the latest information.
© 2013 Audi of America, Inc.
Page 3 of 3
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.