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Service bulletin 05-84-21R

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id11027076
Published by NHTSA2026-01-06
Manufacturer's number05-84-21R
Manufacturer's date2025-12-08
NHTSA componentSUSPENSION

NHTSA's summary

This bulletin announces availability of new front wheel hub assemblies incorporating bearing surfaces having increased resistance to imperfections resulting from shock loads.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Suspension

Vehicles listed
SUBARU FORESTER2019, 2020, 2021
SUBARU LEGACY2015, 2016, 2017, 2018, 2019, 2020, 2021
SUBARU OUTBACK2015, 2016, 2017, 2018, 2019, 2020, 2021
SUBARU TRIBECA2013 to 2014
SUBARU WRX2015, 2016, 2017, 2018, 2019, 2020
SUBARU WRX STI2015, 2016, 2017, 2018, 2019, 2020 (the catalog's model; the bulletin names a series or trim of it)

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
20212262021-04-15. Suspension
21V2630002021-04-15. SUSPENSION:REAR
16V5760002016-08-03. SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DISC:CALIPER; SUSPENSION

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
05-96-262026-02-02. Service bulletin. This bulletin announces design changes to the front stabilizer link to address concerns about boot cracking, which can allow grease to escape.
05-97-252026-01-06. Service bulletin. This Bulletin announces a design change to the rear stabilizer bar bushing to address knocking sounds as a result of excessive clearance between the stabilizer bar and the bushing. The updated bushing features enhanced rubber material that is more elastic in cold climates.
03-96-252025-05-01. Service bulletin. This bulletin announces design changes made to the rear axle hubs. These changes have been implemented to reduce cases water intrusion further leading to harmonic, humming, and grinding type sounds heard from the axle hub while driving.
WQQ-52R2025-04-01. Service bulletin. Due to incomplete repair instructions previously provided in the WQK-47 recall bulletin, the WQQ-52 recall will involve applying additional anti-corrosion material to the four-way (2-2 way) joint connector area of the brake line system on Forester, Impreza, WRX, and STI vehicles previously repaired under the WQK-47 (14V-311) brake line corrosion recall prior to the December 23, 2014 WQK-47 recall bulletin revision. The revisions to the bulletin are for part number changes.
03-94-242024-10-02. Service bulletin. This bulletin outlines the judgment criteria to be used when inspecting front transverse link bushings to reduce unnecessary bushing replacement.
05-91-242024-08-05. Service bulletin. This Bulletin provides guidance for diagnosing a leaking front or rear suspension strut.
05-62-18R2023-06-05. Service bulletin. This bulletin provides a procedure to address customer concerns of surface rust accumulating in the top center retaining nut area of the front strut mounts.
5-88-21R2022-11-03. Service bulletin. This bulletin announces a design change made to the front stabilizer bushings.
05-88-212022-08-02. Service bulletin. This bulletin announces a design change made to the front stabilizer bushings.
05-88-212022-01-04. Service bulletin. This bulletin announces a design change made to the front stabilizer bushings.