Subaru Legacy 2013–2014 — technical service bulletin
Bulletin 02-150-14R · NHTSA communication 10090143 · issued Mar 3, 2014
Technical service bulletin
communication type
Engine
component
2013–2014
model years
4
vehicle entries
Official summary
Revised valve train parts to reduce a warm engine tapping sound from the left cylinder head
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.