Subaru bulletin 02-193-24
What it saysThis 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… NHTSA’s full summary ↓
Subaru filed this with NHTSA as a service bulletin dated Dec 19, 2024, received Jan 3, 2025, about the fuel/propulsion system. It names 49 model years (2016–2024). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis 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).
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 02-193-24 | Service bulletin | Dec 19, 2024 | 11012265 | PDF, 1,977 KB |
What the document itself lists
The manufacturer titles it “Walnut Blast Cleaning Procedure for Carbon”.
Part the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 16519AA100 | — | — |
Read by machine from the document NHTSA serves (11 pages), read Sep 30, 2026. A part number is shown only where it matches Subaru’s own catalogue shape, an operation only with its code and time, and a description only where the reader got it whole; anything it could not settle is left out, and the PDF is the record. Times are the manufacturer’s warranty allowances, not a quote. Listings and prices on eBay Motors are the seller’s.
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The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themand 9 more on this site: 2024 Subaru WRX, 2023 Subaru WRX, 2022 Subaru WRX, 2021 Subaru WRX, 2020 Subaru WRX, 2019 Subaru WRX, 2018 Subaru WRX, 2017 Subaru WRX, 2016 Subaru WRX.
A vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 49 model years this bulletin names have filed 8,116 complaints with NHTSA since 2015. 804 of them name Engine, Fuel/Propulsion System — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
On the 2016 Subaru Forester, the 33 owners who gave an odometer reading for Engine reported it at a median of 42,000 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
Driving my car as any person would, at the 3519 mile mark on the odometer the engine low oil light came on, it took (1.5Q) of oil to top it off. This is a brand new car no one buys a new car to add oil to it, then to get told by the dealership that it’s normal for up to (2Q) of oil to be added because it’s the only AWD boxer, but yet the…
2024 Subaru WRX · Engine · filed with NHTSA Mar 24, 2025
At around the 2000 mile mark I noticed a drastic reduction in fuel econemy. I also started noticing metal particles in the engine oil. I also noticed a significant drop in engine power as well. This is a sign of debris getting in the engine and causing metal particles to become broken off. My mileage went from 460-480 mpt to 360-380 mpt.
2019 Subaru Crosstrek · Engine · filed with NHTSA Oct 27, 2019
I would just like to complain about the excess Rtv on the engine oil pan that has been demonstrated on numerous videos of people opening up the oil drain pan and finding chunks of Rtv blocking some of the engine oil pickup tube. I have not opened up my oil drain pan due to cost. This has not lead to failure as of yet but it is worrisome.
2023 Subaru WRX · Engine · filed with NHTSA Jul 18, 2024
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the fuel/propulsion system
Source: same model, same component group9 other manufacturer communications filed against these Subaru models under the same component group (fuel/propulsion system), newest first. The eight newest are listed; the rest are on the Subaru list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 09-123-24R | Service bulletin | Jul 28, 2026 | This bulletin announces the design change made to the high-pressure fuel pump developed to prevent DTC P0087… |
| 09-81-21R | Service bulletin | Jul 27, 2026 | This bulletin announces design changes made to the fuel injector and fuel pipe in response to the DTCs listed DTC P030* / Engine Knocking /… |
| 09-140-26 | Service bulletin | Jul 13, 2026 | 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. |
| WRD-26R | Service bulletin | Apr 2, 2026 | Subaru of America, Inc. (Subaru) has initiated a new safety recall for certain 2025 model year Forester Hybrid Electric vehicles and 2026 mo… |
| 09-123-24 | Service bulletin | Jan 8, 2026 | This bulletin announces the design change made to the high-pressure fuel pump developed to prevent DTC P0087… |
| 09-82-23R | Service bulletin | Dec 12, 2025 | This bulletin announces design changes made to the fuel tank and vent tubes. The new fuel tank and vent tubes use a material with increased… |
| 09-129-24R | Service bulletin | Jan 7, 2025 | In the interest of customer satisfaction, Subaru of America, Inc. (SOA) is extending the Warranty coverage time period for the fuel pump imp… |
| 09-82-23 | Service bulletin | Jan 8, 2024 | This bulletin announces design changes made to the fuel tank and vent tubes. An enhanced material has been incorporated into the production… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Subaru, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Subaru 02-193-24 a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the 02-193-24 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way.
Which vehicles does 02-193-24 cover?
The manufacturer filed it against 49 model years: 2024 Subaru Ascent, 2023 Subaru Ascent, 2022 Subaru Ascent, 2021 Subaru Ascent, 2020 Subaru Ascent, 2019 Subaru Ascent and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.