TSB 09-74-21R — Subaru Service bulletin
09-74-21R is a service bulletin on file with NHTSA for 7 Subaru models, 2015–2026 model years, filed and re-filed as 2 documents. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. This bulletin provides updated parts information and a service procedure to follow for removing accumulated carbon deposits from fuel injectors and internal engine components (e.g. intake valves and / or manifold, and combustion chambers). (This is an revised version of the…
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Vehicles and model years 09-74-21R names
| Vehicle | Model years |
|---|---|
| Subaru Ascent | 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026 |
| Subaru Crosstrek | 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026 |
| Subaru Forester | 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026 |
| Subaru Impreza | 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026 |
| Subaru Legacy | 2020, 2021, 2022, 2023, 2024, 2025 |
| Subaru Outback | 2020, 2021, 2022, 2023, 2024, 2025, 2026 |
| Subaru WRX | 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025 |
Every document filed under 09-74-21R
Manufacturers re-issue a bulletin as the repair changes, and file separate copies for technicians and for owners. All of them carry the same number.
| Document ID | Filed | Type |
|---|---|---|
| 09-74-21R | June 26, 2026 | Service bulletin |
| 09-74-21R | December 12, 2025 | Service bulletin |
What 09-74-21R covers
Fuel system, Engine — the component vocabulary NHTSA files this communication under.
Questions buyers ask
What is TSB 09-74-21R?
09-74-21R is a service bulletin filed with NHTSA by Subaru, covering 7 Subaru models across the 2015–2026 model years. NHTSA's summary reads: This bulletin provides updated parts information and a service procedure to follow for removing accumulated carbon deposits from fuel injectors and internal engine components (e.g. intake valves and / or manifold, and combustion chambers). (This is an revised version of the…
Which vehicles does 09-74-21R cover?
NHTSA's file names Subaru Ascent (2019–2026); Subaru Crosstrek (2018–2026); Subaru Forester (2019–2026); Subaru Impreza (2017–2026); Subaru Legacy (2020–2025); Subaru Outback (2020–2026); Subaru WRX (2015–2025). A bulletin number can be re-issued against more vehicles later, so check the model-year list on this page against your own.
Is TSB 09-74-21R a recall, and is the repair free?
No. 09-74-21R is repair guidance the manufacturer sent its dealers, not a safety defect finding. You pay for the work unless the vehicle is still under warranty. Recall repairs, by contrast, are always free.
How do I get the full text of 09-74-21R?
Take the document ID to a dealer's service desk, or search NHTSA's manufacturer-communications records. This page carries every document ID filed under 09-74-21R, its date, and NHTSA's own summary from the public file.
Every number on this page is a count of records in the federal complaint, recall, and investigation files published by NHTSA's Office of Defects Investigation. This page lists only what NHTSA's manufacturer-communications file records under 09-74-21R. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.