# 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: 10198768
- Published by NHTSA: 2021\-07\-03
- Manufacturer's number: 09\-74\-21R
- Manufacturer's date: 2021\-06\-28
- NHTSA component: ENGINE AND ENGINE COOLING

## 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/2021/MC-10198768-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10198768-9999.pdf)

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

## Components

Engine

## Vehicles listed

- 2019 to 2021 SUBARU ASCENT
- 2018 to 2021 SUBARU CROSSTREK
- 2014 to 2021 SUBARU FORESTER
- 2017 to 2021 SUBARU IMPREZA
- 2020 to 2021 SUBARU LEGACY
- 2020 to 2021 SUBARU OUTBACK
- 2015 to 2021 SUBARU WRX

## Recalls for the same vehicles and component

- [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
- [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
- [2019526](/recalls/tc/2019526.md), 2019-10-17: Engine
- [2019525](/recalls/tc/2019525.md), 2019-10-17: Engine
- [19V745000](/recalls/nhtsa/19V745000.md), 2019-10-17: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CRANKCASE \(PCV\)
- [19V744000](/recalls/nhtsa/19V744000.md), 2019-10-17: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CRANKCASE \(PCV\)
- [16V162000](/recalls/nhtsa/16V162000.md), 2016-03-21: ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER
- [2016122](/recalls/tc/2016122.md), 2016-03-17: 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.
- [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 \(e.g. intake valves and / or manifold, and combustion chambers\). \(This is an revised version of the original bulletin.\)
- [02\-196\-26](/bulletins/11034257.md), 2026-07-02, Service bulletin: ENGINE. This bulletin outlines the diagnostic and repair procedure for white smoke emitted from the exhaust after startup.
- [09\-130\-25R](/bulletins/11034243.md), 2026-07-02, Service bulletin: ENGINE. This bulletin announces the design change made to the exhaust manifold flange nut material that has been changed from stainless steel to medium carbon steel. This change also necessitates a revised tightening torque specification. \(This is an revised version of the original bulletin.\)
- [18\-240\-26](/bulletins/11034237.md), 2026-07-01, Service bulletin: ENGINE. "This bulletin provides a new diagnostic procedure for vehicles equipped with a Denso CP 1, 1.5 and 2.5 head units to provide an enhanced version of the troubleshooting steps for Sound does not come out from the speaker."
- [02\-193\-24R](/bulletins/11033065.md), 2026-06-01, 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 \(e.g. intake valves and / or manifold, and combustion chambers\).

JSON: [/v1/bulletins/10198768](/v1/bulletins/10198768)

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