BMW 228I 2012–2015 — technical service bulletin
Bulletin B110317 · NHTSA communication 10142923 · issued Oct 1, 2017
Technical service bulletin
communication type
Engine and Engine Cooling
component
2012–2015
model years
12
vehicle entries
Official summary
N20 and n26 engine timing chain and oil pump drive chain: limited warranty extension to 7 years/70,000 miles
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.