Lexus HS 250 Hybrid 2010–2012 — technical service bulletin
Bulletin L-TT-0189-15 · NHTSA communication 10111554 · issued Oct 5, 2015
Technical service bulletin
communication type
Engine and Engine Cooling
component
2010–2012
model years
3
vehicle entries
Official summary
TT: There has been some concern with 3 Piece Piston Ring installations for 2AZ-FXE engines. ? This Tech Tip contains the accepted installation method required for Lexus vehicles.
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.