94 LED daytime running lights: differences in color between the two headlights
94 21 36 2023322/3 March 18, 2021. Supersedes Technical Service Bulletin Group 94 number 10-26 dated July
1, 2010 for reasons listed below.
Model(s)

Year

VIN Range

Vehicle-Specific Equipment

A4, S4, A5,
A5
Cabriolet,
A6, A8, S8,
TT, and Q7

2008 - 2022

All

LED lights

TTS

2009 - 2022

S6

2008 – 2018,
2021 - 2022

All

LED lights

A4
Cabriolet,
S4
Cabriolet,
and RS 4
Cabriolet

2008 - 2009

All

LED lights

RS 4, RS 4
Cabriolet

2008

All

LED lights

RS 5, RS 5
Cabriolet

2010 – 2017,
2019, 2021 2022

All

LED lights

RS 5
Sportback

2019, 2021 2022

All

LED lights

A7, TTRS

2012 - 2022

All

LED lights

S7

2012 – 2018,
2020 - 2022

All

LED lights

A3, A3
Cabriolet,
S3, S5
Cabriolet,
and Q3

2015 - 2022

All

LED lights

A3 e-tron

2015 - 2018

All

LED lights

A3
Sportback,
RS 6

2016 - 2018

All

LED lights

RS 3, SQ7

2017 - 2022

All

LED lights

A4 allroad,
S5, and Q5

2010 - 2022

All

LED lights

Page 1 of 3
© 2021 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.

RS 7

2016 – 2018,
2020 - 2022

All

LED lights

A5
Sportback,
S5
Sportback,
SQ5, and
R8

2018 - 2022

All

LED lights

Q8, Audi etron quattro

2019 - 2022

All

LED lights

A6 allroad,
SQ8, RS
Q8,, and
Audi e-tron
Sportback

2020 - 2022

All

LED lights

A6 Avant,
RS 6 Avant

2021 - 2022

All

LED lights

Condition
REVISION HISTORY
Revision

Date

Purpose

3

-

Revised header (Added MY 21 and 22)

2

07/01/2010

Revised header (Specified 2011 models)

1

06/02/2010

Initial publication

Customer states:
 The daytime running light LEDs in the headlights have slightly different shades of color.
Workshop findings:
 There are no related DTCs stored.

Technical Background
The minor color differences of the LEDs are caused by the coating of the blue LED with yellow phosphor. This
coating is necessary to get white LEDs.

Page 2 of 3
© 2021 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.

A permissible range of white for the road traffic is
defined by law (Figure 1, Area 1 within blue dotted
line).
The LED manufacturer sorts the complete production
volume according to even smaller color
ranges (Figure 1, Area 2 in black grid).
To get the fewest possible color deviations, Audi uses
only part of the manufacturer’s already limited range
and thus only a small section of what is legally
permissible for road traffic (Figure 1, Area 3).
Figure 1. Section of the color triangle; color range
according to DIN 5033. The permissible range of white
for road traffic.
In production, a finer color selection is not possible; this can lead to minimal color differences. This is normal.

Production Solution
Not applicable.

Service
Please explain the Technical Background to the customer. Do not carry out any repairs.

Warranty
This TSB is informational only and not applicable to any Audi Warranty.

Additional Information
All part and service references provided in this TSB (2023322) 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.
©2021 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.

Page 3 of 3
© 2021 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.