BMW Z4 2009–2013 — technical service bulletin
Bulletin 631410 · NHTSA communication 10150124 · issued Mar 1, 2013
Technical service bulletin
communication type
Exterior Lighting
component
2009–2013
model years
5
vehicle entries
Official summary
Condensation builds up inside the taillight lens.
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.