Scion TC 2007–2015 — technical service bulletin
Bulletin S-TT-0099-15 · NHTSA communication 10096355 · issued Oct 1, 2015
Technical service bulletin
communication type
Engine
component
2007–2015
model years
12
vehicle entries
Official summary
"tt: there has been some concern with 3 piece piston ring installations for 2az-fe engines. This tech tip contains the accepted installation method required for scion vehicles."
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.