BMW Z4 2009–2011 — technical service bulletin
Bulletin 121210 · NHTSA communication 10162418 · issued Jul 9, 2019
Technical service bulletin
communication type
Engine and Engine Cooling
component
2009–2011
model years
3
vehicle entries
Official summary
"Engine Idle Speed Dips Too Low While Braking at Lower Vehicle Speeds. The engine speed may drop too low when slowing to a stop, braking at low road speeds, or while parking the car. This occurs intermittently, but can be more apparent when the automatic transmission selector lever is in the ""Sport mode"" position. Unfavorable DME software application"
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.