Subaru Impreza 2012–2013 — technical service bulletin
Bulletin 0214613 · NHTSA communication 10235909 · issued Oct 7, 2013
Technical service bulletin
communication type
Engine and Engine Cooling
component
2012–2013
model years
3
vehicle entries
Official summary
Revised Valve Train Parts to Reduce a Warm Engine Tapping or Sewing Machine type Sound from the Left Cylinder Head
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.