Subaru WRX 2015–2022 — technical service bulletin
Bulletin 09-74-21R · NHTSA communication 10222368 · issued Sep 27, 2022
Technical service bulletin
communication type
Engine and Engine Cooling
component
2015–2022
model years
8
vehicle entries
Official summary
This bulletin provides updated parts information and a service procedure to follow for removing accumulated carbon deposits from fuel injectors and internal engine components.
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.