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OE Quality
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Bosch
Starter (Remanufactured)Bosch SR9521X Starter Motor
| Brand | Bosch SR9521X |
|---|---|
| Mounting Bolt Hole Quantity | 2 |
| Mounting Hardware Included | No |
| Mounting Shims Included | No |
| New Or Remanufactured | Remanufactured |
| Nose Cone Material | Aluminum |
| Nose Cone Type | Closed Nose |
| Original Equipment Manufacturer Names | BO |
| Power Rating | 1.5 |
| Solenoid Attached | Yes |
| Starter Finish | Aluminum |
| Starter Rotation | Clockwise |
| Tooth Quantity | 13 |
| Voltage | 12 |
| Product line | Starter (Remanufactured) |
| Fits | BMW · 109 vehicles |
Remanufactured starter. Built and tested for dependable performance and reliability.
Aluminum nose cone. Lightweight construction with a closed-nose design.
Solenoid attached. Ready for a cleaner, more complete installation.
Cross-references 12417631558 and 12417631559 for the same application. See all 2.
$331.48Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
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Step 2 — Quantity
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Free returns within 60 days if it doesn't fit when fitment is verified.
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Bosch SR9521X Starter for BMW
The Bosch SR9521X is a remanufactured 12-volt starter built for BMW applications that require reliable cranking performance and OE-style fitment. It features a 1.5 kW power rating, clockwise rotation, and a closed aluminum nose cone for a direct replacement solution.
Bosch Premium Starters are engineered, assembled, and tested to deliver consistent starting performance and dependable operation. The SR9521X is a remanufactured starter for BMW 335i, 435i, 535i, X3, X4, X5, X6, M2, M3, M4, and select 640i and 740i models.
- Brand: Bosch Starter (Remanufactured)
- Part number: SR9521X
- 12-volt electrical system
- 1.5 kW power rating
- Clockwise starter rotation
- Closed nose design with aluminum nose cone and aluminum finish
- Solenoid attached
- 13-tooth drive
- 2 mounting bolt holes
- Remanufactured for OE-style replacement
Fitment Details
- Fits 2016-2021 BMW M2, N/A.
- Fits 2015-2020 BMW M4, N/A.
- Fits 2013-2019 BMW 640i Gran Coupe, N/A.
- Fits 2014-2019 BMW 640i xDrive Gran Coupe, N/A.
- Fits 2015-2019 BMW X6, N/A.
- Fits 2013-2018 BMW 640i, N/A.
- Fits 2014-2018 BMW 640i xDrive, N/A.
- Fits 2015-2018 BMW M3, N/A.
- Fits 2017-2018 BMW X4, N/A, with Start/Stop Feature.
- Fits 2014-2018 BMW X5, N/A.
- Fits 2014-2017 BMW 535i GT, N/A.
- Fits 2014-2017 BMW 535i GT xDrive, N/A.
- Fits 2011-2017 BMW X3, N/A.
- Fits 2016 BMW 335i GT xDrive, N/A.
- Fits 2015-2016 BMW 435i, N/A.
- Fits 2015-2016 BMW 435i Gran Coupe, N/A.
- Fits 2015-2016 BMW 435i xDrive, N/A.
- Fits 2015-2016 BMW 435i xDrive Gran Coupe, N/A.
- Fits 2014-2016 BMW 535i, N/A.
- Fits 2014-2016 BMW 535i xDrive, N/A.
- Fits 2014-2016 BMW M235i, N/A.
- Fits 2015-2016 BMW M235i xDrive, N/A.
- Fits 2015-2016 BMW X4, N/A.
- Fits 2014-2015 BMW 335i, N/A, with Start/Stop Feature.
- Fits 2014-2015 BMW 335i GT xDrive, N/A, with Start/Stop Feature.
- Fits 2014-2015 BMW 335i xDrive, N/A, with Start/Stop Feature.
- Fits 2013-2015 BMW 740i, N/A, with 1.5 Kilowatt Starter.
- Fits 2013-2015 BMW 740Li, N/A, with 1.5 Kilowatt Starter.
- Fits 2013-2015 BMW 740Li xDrive, N/A.
- Fits 2015 BMW ActiveHybrid 3, N/A.
- Fits 2013 BMW ActiveHybrid 3, N/A.
- Fits 2014 BMW 435i, N/A, with Start/Stop Feature.
- Fits 2014 BMW 435i xDrive, N/A, with Start/Stop Feature.
- Fits 2014 BMW ActiveHybrid 3, N/A, with Start/Stop Feature.
What This Starter Helps Address
- Slow or weak engine cranking on BMW start-up
- No-start conditions caused by starter motor failure
- Intermittent starting issues tied to worn internal starter components
- Clicking at key-on when the starter cannot engage properly
- Replacement needs for BMW models with Start/Stop systems
Installation Notes
Verify the vehicle’s year, model, and engine/start-stop configuration before ordering. This Bosch SR9521X starter uses a clockwise rotation, a closed nose design, and a 13-tooth drive, so matching the original unit’s specifications is important for proper operation. Mounting hardware and shims are not included.
This part cross-references Bosch OE-style applications for the same BMW starter use case. Part numbers SR9521X and 12417631558/12417631559 are associated with this application family.
Quality Assurance
Bosch Premium Starters are built and tested to support consistent performance and reliability in demanding starting systems. The SR9521X is remanufactured to provide an OE-style replacement option for BMW vehicles that require a 12-volt, 1.5 kW starter assembly.
This part fits 109 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
| Year | Make | Model | Transmission | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2021 | BMW | M2 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2020 | BMW | M2 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2020 | BMW | M4 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2019 | BMW | 640i Gran Coupe | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2019 | BMW | 640i xDrive Gran Coupe | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2019 | BMW | M2 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2019 | BMW | M4 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2019 | BMW | X6 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2018 | BMW | 640i | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2018 | BMW | 640i Gran Coupe | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2018 | BMW | 640i xDrive | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2018 | BMW | 640i xDrive Gran Coupe | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2018 | BMW | M2 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2018 | BMW | M3 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2018 | BMW | M4 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2018 | BMW | X4 | — | 3.0L | L6 | N/A | with Start/Stop Feature; Starter (Remanufactured) |
| 2018 | BMW | X5 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2018 | BMW | X6 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2017 | BMW | 535i GT | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2017 | BMW | 535i GT xDrive | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2017 | BMW | 640i | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2017 | BMW | 640i Gran Coupe | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2017 | BMW | 640i xDrive | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2017 | BMW | 640i xDrive Gran Coupe | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2017 | BMW | M2 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2017 | BMW | M3 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2017 | BMW | M4 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2017 | BMW | X3 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2017 | BMW | X4 | — | 3.0L | L6 | N/A | with Start/Stop Feature; Starter (Remanufactured) |
| 2017 | BMW | X5 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2017 | BMW | X6 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2016 | BMW | 335i GT xDrive | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2016 | BMW | 435i | Automatic | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2016 | BMW | 435i Gran Coupe | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2016 | BMW | 435i xDrive | Automatic | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2016 | BMW | 435i xDrive Gran Coupe | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2016 | BMW | 535i | Automatic | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2016 | BMW | 535i GT | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2016 | BMW | 535i GT xDrive | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2016 | BMW | 535i xDrive | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2016 | BMW | 640i | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2016 | BMW | 640i Gran Coupe | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2016 | BMW | 640i xDrive | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2016 | BMW | 640i xDrive Gran Coupe | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2016 | BMW | M2 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2016 | BMW | M235i | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2016 | BMW | M235i xDrive | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2016 | BMW | M3 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2016 | BMW | M4 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2016 | BMW | X3 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2016 | BMW | X4 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2016 | BMW | X5 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2016 | BMW | X6 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2015 | BMW | 335i | Automatic | 3.0L | L6 | N/A | with Start/Stop Feature; Starter (Remanufactured) |
| 2015 | BMW | 335i GT xDrive | — | 3.0L | L6 | N/A | with Start/Stop Feature; Starter (Remanufactured) |
| 2015 | BMW | 335i xDrive | Automatic | 3.0L | L6 | N/A | with Start/Stop Feature; Starter (Remanufactured) |
| 2015 | BMW | 435i | Automatic | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2015 | BMW | 435i Gran Coupe | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2015 | BMW | 435i xDrive | Automatic | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2015 | BMW | 435i xDrive Gran Coupe | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2015 | BMW | 535i | Automatic | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2015 | BMW | 535i GT | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2015 | BMW | 535i GT xDrive | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2015 | BMW | 535i xDrive | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2015 | BMW | 640i | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2015 | BMW | 640i Gran Coupe | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2015 | BMW | 640i xDrive | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2015 | BMW | 640i xDrive Gran Coupe | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2015 | BMW | 740i | — | 3.0L | L6 | N/A | with 1.5 Kilowatt Starter; Starter (Remanufactured) |
| 2015 | BMW | 740Li | — | 3.0L | L6 | N/A | with 1.5 Kilowatt Starter; Starter (Remanufactured) |
| 2015 | BMW | 740Li xDrive | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2015 | BMW | ActiveHybrid 3 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2015 | BMW | M235i | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2015 | BMW | M235i xDrive | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2015 | BMW | M3 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2015 | BMW | M4 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2015 | BMW | X3 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2015 | BMW | X4 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2015 | BMW | X5 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2015 | BMW | X6 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2014 | BMW | 335i | Automatic | 3.0L | L6 | N/A | with Start/Stop Feature; Starter (Remanufactured) |
| 2014 | BMW | 335i GT xDrive | — | 3.0L | L6 | N/A | with Start/Stop Feature; Starter (Remanufactured) |
| 2014 | BMW | 335i xDrive | Automatic | 3.0L | L6 | N/A | with Start/Stop Feature; Starter (Remanufactured) |
| 2014 | BMW | 435i | Automatic | 3.0L | L6 | N/A | with Start/Stop Feature; Starter (Remanufactured) |
| 2014 | BMW | 435i xDrive | Automatic | 3.0L | L6 | N/A | with Start/Stop Feature; Starter (Remanufactured) |
| 2014 | BMW | 535i | Automatic | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2014 | BMW | 535i GT | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2014 | BMW | 535i GT xDrive | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2014 | BMW | 535i xDrive | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2014 | BMW | 640i | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2014 | BMW | 640i Gran Coupe | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2014 | BMW | 640i xDrive | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2014 | BMW | 640i xDrive Gran Coupe | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2014 | BMW | 740i | — | 3.0L | L6 | N/A | with 1.5 Kilowatt Starter; Starter (Remanufactured) |
| 2014 | BMW | 740Li | — | 3.0L | L6 | N/A | with 1.5 Kilowatt Starter; Starter (Remanufactured) |
| 2014 | BMW | 740Li xDrive | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2014 | BMW | ActiveHybrid 3 | — | 3.0L | L6 | N/A | with Start/Stop Feature; Starter (Remanufactured) |
| 2014 | BMW | M235i | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2014 | BMW | X3 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2014 | BMW | X5 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2013 | BMW | 640i | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2013 | BMW | 640i Gran Coupe | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2013 | BMW | 740i | — | 3.0L | L6 | N/A | with 1.5 Kilowatt Starter; Starter (Remanufactured) |
| 2013 | BMW | 740Li | — | 3.0L | L6 | N/A | with 1.5 Kilowatt Starter; Starter (Remanufactured) |
| 2013 | BMW | 740Li xDrive | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2013 | BMW | ActiveHybrid 3 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2013 | BMW | X3 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2012 | BMW | X3 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| 2011 | BMW | X3 | — | 3.0L | L6 | N/A | Starter (Remanufactured) |
| No rows match your filter. | |||||||
Directly replaces or cross-references 2 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
1241763155812417631559