Porsche Panamera 2010–2012 — technical service bulletin
Bulletin 122-B3W7F-06 · NHTSA communication 10109301 · issued May 24, 2012
Technical service bulletin
communication type
Electrical System
component
2010–2012
model years
3
vehicle entries
Official summary
Concerns: Brake light switch Information: Possible replacement of perfectly functioning components when complaint "Brake light stays on" is received/fault code 4340 in PSM control unit.
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.