Subaru WRX 2015–2018 — technical service bulletin
Bulletin 02-178-18 · NHTSA communication 10145078 · issued Aug 29, 2018
Technical service bulletin
communication type
Power Train
component
2015–2018
model years
8
vehicle entries
Official summary
This Service Information bulletin announces a design change made to the rubber timing hole access plug to improve its retention and prevent water intrusion into the converter case.
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.