A901238 2032113-

Technical Service Bulletin
90 Outside air temperature reading: General Information
90 12 38 2032113/1 December 7, 2012.
Model(s)
Year
VIN Range
Vehicle-Specific Equipment
All
2008-2014
All
Not Applicable
Condition
The customer may state that the outside ambient temperature display is incorrect.
Technical Background
To achieve a smoothening effect of the displayed outside ambient temperature, the value shown does not
instantaneously follow the temperature sensor measurement. The display will not change faster than 4° F (2° C)
per minute. This concept applies to both falling and rising temperatures.
A programming strategy is also implemented to avoid incorrect readings on a parked vehicle, due to the
temperature sensor being affected by outside influences such as radiant heat from the engine bay, elevated road
surface temperatures, etc. Incorrect readings are avoided through the following logic:
 After switching the ignition on, temperature changes are only shown after 30 seconds for a stationary vehicle
(vehicle speed = zero and engine switched off).
 Only when the vehicle drives faster than 12 mph (20 km/h), rising temperature values are displayed during the
first 3 miles (5 km).
 If the measured ambient temperature is above the displayed value, but falling, the display is not changed.
 When the coolant temperature reaches 104° F (40° C) and the speed drops to under 12 mph (20 km/h), only
falling ambient temperature values are shown. For example, in stop and go traffic when the vehicle is often
below 12 mph (20 km/h), it can take some time before the displayed temperature is correct.
 If conditions above are noted during these typical driving scenarios, the sensor is not at fault and does not
need to be replaced.
Production Solution
Not Applicable
Page 1 of 2
© 2012 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 Service Bulletin
Service
Explain the operation 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.
Page 2 of 2
© 2012 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.