BMW X5 2014–2017 — technical service bulletin
Bulletin B120116 · NHTSA communication 10151075 · issued Feb 1, 2016
Technical service bulletin
communication type
Engine
component
2014–2017
model years
7
vehicle entries
Official summary
Under certain engine operating conditions the measured air mass between the cylinder banks 1-4 and 5-8 is miscalculated by the DME's. This could result in incorrect engine torque and mismatched ignition parameters with the possibility of internal engine damage.
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.