# Service bulletin 09\-74\-21R

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 11005617
- Published by NHTSA: 2024\-08\-05
- Manufacturer's number: 09\-74\-21R
- Manufacturer's date: 2024\-07\-18
- NHTSA component: ENGINE; FUEL/PROPULSION SYSTEM

## NHTSA's 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 \(e.g. intake valves and / or manifold, and combustion chambers\).

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2024/MC-11005617-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2024/MC-11005617-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine, Fuel system

## Vehicles listed

- 2019 to 2024 SUBARU ASCENT
- 2018 to 2024 SUBARU CROSSTREK
- 2014 to 2024 SUBARU FORESTER
- 2017 to 2024 SUBARU IMPREZA
- 2020 to 2024 SUBARU LEGACY
- 2020 to 2024 SUBARU OUTBACK
- 2015 to 2024 SUBARU WRX

## Recalls for the same vehicles and component

- [23V723000](/recalls/nhtsa/23V723000.md), 2023-10-26: ENGINE AND ENGINE COOLING
- [22V473000](/recalls/nhtsa/22V473000.md), 2022-07-01: ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\); ELECTRICAL SYSTEM:WIRING
- [2021466](/recalls/tc/2021466.md), 2021-07-29: Fuel System
- [21V587000](/recalls/nhtsa/21V587000.md), 2021-07-29: FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP
- [21V264000](/recalls/nhtsa/21V264000.md), 2021-04-15: ELECTRICAL SYSTEM:SOFTWARE; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\):SOFTWARE; ELECTRICAL SYSTEM:IGNITION; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE
- [2020162](/recalls/tc/2020162.md), 2020-04-16: Fuel System
- [20V218000](/recalls/nhtsa/20V218000.md), 2020-04-16: FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP
- [2019604](/recalls/tc/2019604.md), 2019-12-02: Engine
- [19V856000](/recalls/nhtsa/19V856000.md), 2019-12-02: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CRANKCASE \(PCV\)
- [2019527](/recalls/tc/2019527.md), 2019-10-17: Engine

## Other bulletins for the same vehicles and component

- [09\-141\-26](/bulletins/11037946.md), 2026-10-05, Service bulletin: ENGINE; ELECTRICAL SYSTEM. This Bulletin provides a diagnostic procedure for customer concerns about hesitation, reduced acceleration, or lack of power when driving uphill or under heavy engine load.
- [09\-84\-22R](/bulletins/11037934.md), 2026-10-05, Service bulletin: ENGINE. This bulletin announces Warranty Extension and design changes made to the front exhaust pipe and covers to address the concerns of some customers regarding an odor or a rattle\-type noise/fluttering sound coming from the undercarriage, during acceleration. This is an revised version of the original bulletin.
- [09\-98\-22R](/bulletins/11036821.md), 2026-09-03, Service bulletin: ENGINE; ELECTRICAL SYSTEM. This bulletin announces the availability of new reprograming files for the Engine Control Module \(ECM\) developed to remedy the following DTCs: P0016, P0017, P0018, P0019, P0014, P0024, P0128, P2109. If any of the DTCs listed above are found to be stored in the ECM, follow the procedures outlined in the bulletin. This is an revised version of the original bulletin.
- [02\-196\-26R](/bulletins/11036811.md), 2026-09-03, Service bulletin: ENGINE. This service bulletin outlines the diagnostic and repair procedure for white smoke emitted from the exhaust after startup. This is an revised version of the original bulletin.
- [09\-123\-24R](/bulletins/11035660.md), 2026-08-04, Service bulletin: ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM. This bulletin announces the design change made to the high\-pressure fuel pump developed to prevent DTC P0087 \(Fuel Rail/System Pressure – Too Low Bank 1\). \(This is an revised version of the original bulletin.\)
- [09\-81\-21R](/bulletins/11035654.md), 2026-08-04, Service bulletin: ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM. This bulletin announces design changes made to the fuel injector in response to the DTCs listed. \(This is an revised version of the original bulletin.\)
- [07\-242\-26](/bulletins/11035637.md), 2026-08-04, Service bulletin: ENGINE; STEERING. This bulletin outlines a repair procedure to be performed if DTC B2781 is set in the steering lock control module.
- [09\-140\-26](/bulletins/11035634.md), 2026-08-04, Service bulletin: FUEL/PROPULSION SYSTEM. This bulletin announces a design change to the filler cap thread shape to improve ease of installation of the fuel cap onto the filler neck.
- [02\-193\-24R](/bulletins/11034269.md), 2026-07-02, Service bulletin: ENGINE. This bulletin provides updated parts information and a service procedure to follow for removing accumulated carbon deposits from fuel injectors and internal engine components \(e.g. intake valves and / or manifold, and combustion chambers\). \(This is an revised version of the original bulletin.\)
- [09\-74\-21R](/bulletins/11034264.md), 2026-07-02, Service bulletin: ENGINE; FUEL/PROPULSION SYSTEM. This bulletin provides updated parts information and a service procedure to follow for removing accumulated carbon deposits from fuel injectors and internal engine components \(e.g. intake valves and / or manifold, and combustion chambers\). \(This is an revised version of the original bulletin.\)

JSON: [/v1/bulletins/11005617](/v1/bulletins/11005617)

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