Factory build sheet
2021 Subaru Legacy Limited
Build 4S3BWAM6-M · 2.5L 4cyl · All-wheel drive · Sedan
VIN positions 1 through 8 read 4S3BWAM6 and position 10 reads M. Those nine characters define this build. Position 9 and positions 11 through 17 differ on every car.
Every Legacy whose VIN starts 4S3BWAM6 and carries M in position 10 left the plant with the same engine, transmission, drivetrain and equipment listed below. We know of 208 of them.
- Decoded Jul 7, 2026
- 208 known VINs
- 2 listed for sale now
Factory specification
As filed by Subaru with NHTSA for this build. Fields the filing does not record are left out entirely — a missing row means no recorded value, not a missing feature.
Engine
- Displacement
- 2.5 L
- Cylinders
- 4
- Engine model
- 25l h4 16v gdi dohc
- Horsepower
- 182 hp
- Fuel type
- Gasoline
Drivetrain
- Drive type
- All-wheel drive
Body & chassis
- Body class
- Sedan/Saloon
- NHTSA body type
- PASSENGER CAR
- Doors
- 4
- Seats
- 5
- Seat rows
- 2
- Manufacturer
- SUBARU OF AMERICA, INC
Weight rating
- GVWR class
- Class 1
- GVWR
- 6,000 lb or less
Gross vehicle weight rating is the loaded ceiling set by the manufacturer, not the car's own weight.
Driver assistance, as built
- Forward collision warning Standard
- Crash imminent braking Standard
- Lane departure warning Standard
- Lane keeping assistance Standard
- Adaptive cruise control Standard
- Blind spot warning Standard
Systems the filing does not record are not listed above. Check the window sticker of the exact car before you rely on any single feature.
The same build, other model years
Subaru used the VIN pattern 4S3BWAM6 for 4 model years. Nothing but the year changes between these pages, so the price gap between them is depreciation on an identical car.
How this VIN pattern is read
A 17-character VIN carries two kinds of information: what was built, and which one it is. This page is the first kind — the nine highlighted positions.
| Positions | Characters | What they encode |
|---|---|---|
| 1–3 | 4S3 | SUBARU OF AMERICA, INC · World manufacturer identifier |
| 4–8 | BWAM6 | Model, body style, engine and restraint system |
| 9 | × | Check digit — computed per vehicle, not part of the build |
| 10 | M | Model year — 2021 |
| 11 | × | Assembly plant |
| 12–17 | ×××××× | Production sequence number, unique to each vehicle |
NHTSA safety ratings
Crash-test results are published per model year and body style, so they cover the 2021 Subaru Legacy as a whole rather than this build alone.
Overall
★★★★★ 5 / 5
Frontal crash
★★★★★ 5 / 5
Side crash
★★★★★ 5 / 5
Rollover
★★★★★ 5 / 5
3 recall campaigns are recorded for the 2021 Legacy. Recalls are issued per VIN range — check the VIN of the car you are looking at, not the model.
208 vehicles carry this build
Every VIN we have decoded to 4S3BWAM6-M shares the specification above.
- 208 Known VINs
- 2 Listed for sale now
Cars are filed by a fixed rule based on the VIN, so a car never moves between groups.
Neighboring configurations
Other factory configurations of the Legacy, each with its own build sheet. The set is fixed by the VIN patterns themselves, so it does not shuffle as prices or inventory move.
- 2021 Touring+M/R+Navi(HK) 2.4L 4-cyl · Sedan saloon · AWD 1,741 vehicles · $23,119 median
- 1991 L 2.2L 4-cyl 68 vehicles
- 1992 L 2.2L 4-cyl · Sedan saloon 45 vehicles
- 2022 Premium 2.5L 4-cyl · Sedan saloon · AWD 2,203 vehicles · $19,998 median
- 2022 Sport 2.5L 4-cyl · Sedan saloon · AWD 530 vehicles · $24,997 median
Keep going
Where this data comes from
Specification fields are decoded from the manufacturer's filings in the NHTSA vPIC database, keyed on VIN positions 1–8 and 10. We publish the filed values as they stand and leave out anything the filing does not record.
Vehicle counts come from the 208 VINs of this build we have seen in dealer inventory. They are a sample of the road population, not a production figure.