A011507 2028344-
Service Bulletin Details
Public Details for: A011507 2028344-
Supersedes technical service bulletin group 01 number 13-69 dated february 14, 2013. Noises and inconsistent engine operation after cold start during the catalyst heating phase. The customer may misinterpret these symptoms as engine misfiri
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Technical Service Bulletin 01 Idle speed characteristic during cold start 01 15 07 2028344/5 February 13, 2015. Supersedes Technical Service Bulletin Group 01 number 13-69 dated February 14, 2013 for reasons listed below. Model(s) Year VIN Range Vehicle-Specific Equipment All 2005 - 2016 All Not Applicable Condition REVISION HISTORY Revision Date Purpose 5 - Revised header data (Added model years) 4 2/14/2013 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 and inconsistent engine operation after cold start during the catalyst heating phase. • The customer may misinterpret these symptoms as engine misfiring. • This bulletin applies only to non-diesel engines. 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 catalyst is heated to the necessary operating temperature of over 300°C (572°F). The catalyst heating phase is achieved by late ignition angles and by introducing additional fresh air to the exhaust valves (secondary air system). Late ignition angles ensure that the exhaust gas from the cylinders has a higher temperature. This exhaust gas includes fuel that is un-burnt, and was deliberately injected in 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. © 2015 Audi of America, Inc. Page 1 of 2 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 Conditions for the catalyst heating phase: Depending on conditions, the time of the catalyst heating phase varies. Production Solution No change. Service 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 (2028344) are subject to change and/or removal. Always check with your Parts Department and service manuals for the latest information. © 2015 Audi of America, Inc. Page 2 of 2 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.