Audi A4 2008–2009 — technical service bulletin
Bulletin A941431 2021751- · NHTSA communication 10122205 · issued Jan 16, 2014
Technical service bulletin
communication type
Electrical System
component
2008–2009
model years
4
vehicle entries
Official summary
Supersedes Technical Service Bulletin Group 94 number 10-19 dated June 7, 2010. The xenon headlight on one side of the vehicle flickers or is inoperative. The condition may be intermittent or permanent. DTCs are stored in the electronic central electronics control module for the affected headlight. Only xenon bulbs manufactured by Philips are affected. The xenon bulb may have an internal leak at the crimp of the electrodes, and xenon gas can be released. Without an adequate amount of xenon gas, the bulb cannot establish a stable light arc. The xenon igniter control unit (ballast) repeatedly tr
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.