Lexus HS 250 Hybrid 2010–2012 — technical service bulletin
Bulletin L-TT-0188-15 · NHTSA communication 10096767 · issued Sep 30, 2015
Technical service bulletin
communication type
Engine
component
2010–2012
model years
3
vehicle entries
Official summary
"tt: based on current part order allocation, some piston types have been incorrectly identified while undergoing the ze7 2az oil consumption repair procedure. Replacement pistons for ze7 should be ordered based on the pistons removed from existing cylinder block and no longer by measurement. This tech tip includes information regarding production allocation and instructions for identifying piston type on subject engines. This will be published in the next revision of l-sb-0006-15."
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.