BMW 550I 2009–2015 — technical service bulletin
Bulletin 122514 · NHTSA communication 10148022 · issued Sep 1, 2014
Technical service bulletin
communication type
Electrical System
component
2009–2015
model years
24
vehicle entries
Official summary
N63T: Improvements to Bosch Spark Plug. Various engine performance symptoms could occur if the spark plug insulator becomes damaged: * The Service Engine Soon (MIL) may be on with rough running and misfire fault(s) stored. * Intermittent performance or rough running without a relevant DME fault stored. The spark plug insulator could be damaged in cases of combustion faults such as misfiring, ignition knock or super knocking conditions.
Vehicles covered
- 2011 BMW 550I
- 2012 BMW 550I
- 2013 BMW 550I
- 2014 BMW 550I
- 2010 BMW 550I Gran Turismo
- 2011 BMW 550I Gran Turismo
- 2012 BMW 550I Gran Turismo
- 2012 BMW 650I
- 2013 BMW 650I
- 2014 BMW 650I
- 2009 BMW 750I
- 2010 BMW 750I
- 2011 BMW 750I
- 2012 BMW 750I
- 2013 BMW 750I
- 2014 BMW 750I
- 2009 BMW 750LI
- 2010 BMW 750LI
- 2011 BMW 750LI
- 2012 BMW 750LI
- 2013 BMW 750LI
- 2014 BMW 750LI
- 2014 BMW X5
- 2015 BMW X5
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.