The 2021 BMW M850I has 35 electrical parts with verified fitment on this page — 6 part types and 16 brands, covering the 4.4L V8 Turbocharged engine. Each part includes a manufacturer part number and application notes.
On the 2021 BMW M850I, the electrical system covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors. Most of the listed parts are Battery (23 parts), Starter Motor (5 parts) and Alternator / Generator (4 parts). The other 3 part types cover the remaining 3 parts.
The 2021 BMW M850I came with a single engine, the 4.4L V8 Turbocharged, and every part is verified against it.
16 brands supply electrical parts for the 2021 BMW M850I, led by FVP (4 parts), ACDELCO (4 parts) and DEKA (3 parts), plus 13 more brands. Quality grades include AGM, Remanufactured and New.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2021 BMW M850I. 6 parts have it, including ACDELCO 47AGM (Battery) and PURE ENERGY 12453 (Starter Motor). Each part number opens a page with every vehicle that part fits.
Alternator / Generator
New
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALEO | 439964 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Valeo Origins New OE Technology | View on Amazon |
| WAI GLOBAL | 21084N | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 250 AmpsValeo | View on Amazon |
Remanufactured
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP | 11913 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Remanufactured | View on Amazon |
| PURE ENERGY | 11913 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Remanufactured | View on Amazon |
This table covers the alternators that charge the battery and run the electrical load. Typical signs include dim lights at idle, a battery lamp, or a growl from the charging pulley. Load-test the battery and inspect the belt and grounds — a bad ground mimics a failed alternator.
4 Alternator / Generator parts for the 2021 BMW M850I come from 4 brands — VALEO, WAI GLOBAL, FVP and 1 other brand.
The New section lists 2 options from VALEO and WAI GLOBAL — brand-new units rather than rebuilt ones. VALEO 439964 is listed in this group.
The Remanufactured section lists 2 options from FVP and PURE ENERGY — factory-rebuilt units with new wear components. FVP 11913 is listed in this group.
This group includes VALEO 439964, WAI GLOBAL 21084N and FVP 11913 and the remaining parts above.
Battery
AGM (Extended Life)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Popular | 47AGM | 🇺🇸 US 🇨🇦 CA | AGMBCI Group: 47 | View on Amazon |
| DEKA Popular | 9A47 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | IntimidatorAGM | View on Amazon |
| LUCAS Popular | LBAGM001A | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | BCI Group: 47AGM | View on Amazon |
| LUCAS Popular | LBAGM005A | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | BCI Group: 94RAGM | View on Amazon |
| LUCAS Popular | LBAGM007A | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | BCI Group: 95RAGM | View on Amazon |
| ACDELCO | 47SAGM | 🇺🇸 US 🇨🇦 CA | AGMBCI Group: 47 | View on Amazon |
| ACDELCO | 49AGM | 🇺🇸 US 🇨🇦 CA | AGMBCI Group: 49 | View on Amazon |
| ACDELCO | 49AGMHR | 🇺🇸 US 🇨🇦 CA | High ReserveAGM | View on Amazon |
| BOSCH | S6588B | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | AGMAGM | View on Amazon |
| DEKA | 9A49 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | IntimidatorAGM | View on Amazon |
| DEKA | 9A95R | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | IntimidatorAGM | View on Amazon |
| EXIDE | MXH5L247 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Marathon MaxBCI Group 47 (H5) | View on Amazon |
| EXIDE | MXH8L549 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Marathon MaxBCI Group 49 (H8) | View on Amazon |
| EXIDE | MXH9L695R | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Marathon MaxBCI Group 95R (H9) | View on Amazon |
| FVP | P47AGM | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Platinum AGMBCI Group: 47 | View on Amazon |
| FVP | P49AGM | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Platinum AGMBCI Group: 49 | View on Amazon |
| MOTORCRAFT | BAGM49H8 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Tested Tough AGMBCI Group: 49/H8 or BCI Group 49 | View on Amazon |
| MOTORCRAFT | BAGM95RH9 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Tested Tough AGMBCI Group 95R or BCI Group: 95R/H9 | View on Amazon |
| P1MAX | PMAGMH547 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | BCI Group 47 AGM680 CCA | View on Amazon |
| P1MAX | PMAGMH849 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | BCI Group 49 AGM850 CCA | View on Amazon |
| P1MAX | PMAGMH995R | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | BCI Group 95R AGM950 CCA | View on Amazon |
Performance AGM (Extended Life + Increased Power)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FULLRIVER | FT61047 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | BCI Group 47(Length X Width X Height) 9.49 In x 6.89 In x 7.48 In | View on Amazon |
| FULLRIVER | FT89049 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | BCI Group 49(Length X Width X Height) 13.9 In x 6.89 In x 7.48 In | View on Amazon |
This table covers the batteries listed by group size and specification. Typical signs include slow cranking, a battery lamp, or a no-start after the vehicle sat overnight. Confirm group size and terminal layout in the notes. Clean the posts and the ground before condemning the battery.
23 Battery parts are listed for the 2021 BMW M850I, from ACDELCO, DEKA, LUCAS and 6 other brands. ACDELCO 47AGM carries the "Popular" badge.
The AGM (Extended Life) section lists 21 options from ACDELCO, DEKA, LUCAS and 5 other brands — grouped under the catalog's "AGM (Extended Life)" designation — the notes column spells out what sets them apart. ACDELCO 47AGM is listed in this group.
The Performance AGM (Extended Life + Increased Power) section lists 2 options from FULLRIVER — grouped under the catalog's "Performance AGM (Extended Life + Increased Power)" designation — the notes column spells out what sets them apart. FULLRIVER FT61047 is listed in this group.
Lighting Control Module (LCM)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO | V20730306 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | M850i xDrive Base Model | View on Amazon |
This table covers the modules that control the exterior lighting.
This group shows a single part: VEMO V20730306.
Parking Aid Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VARIOUS MFR | BM1075103 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Customer Paints to Match | View on Amazon |
This table covers the ultrasonic park-aid sensors in the bumper. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors.
This group shows a single part: VARIOUS MFR BM1075103.
Parking Aid Sensor Bracket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VARIOUS MFR | BM1174111 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits RearM850i xDrive Base Model | View on Amazon |
This table covers the brackets that mount the Parking Aid Sensor. Typical signs include a cracked mount, a rattle, or a bracket that no longer holds alignment. Confirm position in the notes. Many brackets look alike and bolt to different corners.
This group shows a single part: VARIOUS MFR BM1174111.
Starter Motor
New
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAI GLOBAL | 16430N | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
Remanufactured
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PURE ENERGY Popular | 12453 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Remanufactured | View on Amazon |
| FVP | 12453 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Remanufactured | View on Amazon |
| REMY | 16304 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Remanufactured | View on Amazon |
| TERREPOWER | 16430 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Remanufactured | View on Amazon |
This table covers the starter motors that crank the engine. Typical signs include no motion, a squeal, or a motor that only runs on one speed. Confirm power, ground and the control module before replacing the motor.
5 Starter Motor parts for the 2021 BMW M850I come from 5 brands — WAI GLOBAL, PURE ENERGY, FVP and 2 other brands. The "Popular" part is PURE ENERGY 12453.
The New section: 1 option from WAI GLOBAL. WAI GLOBAL 16430N is listed in this group.
The Remanufactured section: 4 options from PURE ENERGY, FVP, REMY and 1 other brand. PURE ENERGY 12453 is listed in this group.
Part numbers include PURE ENERGY 12453 and WAI GLOBAL 16430N, among others listed above.
Buying Electrical Parts for a 2021 BMW M850I
On this vehicle, the electrical system covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors.
- Confirm you have the 4.4L V8 Turbocharged engine — every part on this page is matched to it.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, clean or renew the battery terminals and grounds with any charging-system repair.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Battery and Starter Motor .
Frequently Asked Questions
How many electrical parts fit the 2021 BMW M850I?
Our catalog currently lists 35 electrical parts for the 2021 BMW M850I across 6 subcategories and 16 brands, covering the 4.4L V8 Turbocharged engine. Each part is matched to the engine(s) it fits.
What are the signs of electrical problems on a 2021 BMW M850I?
Common symptoms include slow cranking on cold mornings, a battery light that flickers, dim lights at idle, or a check-engine code pointing at a sensor circuit. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, clean or renew the battery terminals and grounds with any charging-system repair.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2021 BMW M850I was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2021 BMW M850I?
Every part on this page is matched to the 4.4L V8 Turbocharged engine. Then test before replacing — a failed alternator and a bad ground can look identical, and sensors are frequently condemned for wiring faults. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 BMW M850I
Electrical Parts for Other BMW M850I Years
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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.