The 2021 BMW 540I has 34 electrical parts with verified fitment on this page — 5 part types and 17 brands, covering the 3.0L L6 Turbocharged engine. Each part includes a manufacturer part number and application notes.
On the 2021 BMW 540I, the electrical system covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors. 30 parts of the 34 listed are Battery (18 parts), Parking Aid Sensor (8 parts) and Starter Motor (4 parts). The other 2 part types cover the remaining 4 parts.
Every part on this page is matched to the 3.0L L6 Turbocharged — the only engine offered in the 2021 BMW 540I.
The most listed brands for 2021 BMW 540I electrical parts are MARELLI (4 parts), DEKA (3 parts) and FVP (3 parts), plus 14 more brands. Quality grades include AGM, Remanufactured and New.
6 parts on this 2021 BMW 540I page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including DEKA 9A49 (Battery) and DORMAN 684134 (Parking Aid Sensor). Click any part number to see every vehicle that part fits.
Battery
AGM (Extended Life)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DEKA Popular | 9A49 | 🇺🇸 US 🇨🇦 CA | IntimidatorAGM | View on Amazon |
| FVP Popular | PLN1AGM | 🇺🇸 US 🇨🇦 CA | Platinum AGMBCI Group: 140R | View on Amazon |
| LUCAS Popular | LBAGM005A | 🇺🇸 US 🇨🇦 CA | BCI Group: 94RAGM | View on Amazon |
| LUCAS Popular | LBAGM007A | 🇺🇸 US 🇨🇦 CA | BCI Group: 95RAGM | View on Amazon |
| ACDELCO | 49AGM | 🇺🇸 US 🇨🇦 CA | AGMBCI Group: 49 | View on Amazon |
| ACDELCO | 49AGMHR | 🇺🇸 US 🇨🇦 CA | High ReserveAGM | View on Amazon |
| ACDELCO | 95RAGM | 🇺🇸 US 🇨🇦 CA | AGMBCI Group: 95R | View on Amazon |
| BOSCH | S6588B | 🇺🇸 US 🇨🇦 CA | AGMAGM | View on Amazon |
| DEKA | 9A140R | 🇺🇸 US 🇨🇦 CA | IntimidatorAGM | View on Amazon |
| DEKA | 9A95R | 🇺🇸 US 🇨🇦 CA | IntimidatorAGM | View on Amazon |
| EXIDE | MXH8L549 | 🇺🇸 US 🇨🇦 CA | Marathon MaxBCI Group 49 (H8) | View on Amazon |
| EXIDE | MXH9L695R | 🇺🇸 US 🇨🇦 CA | Marathon MaxBCI Group 95R (H9) | View on Amazon |
| FVP | P49AGM | 🇺🇸 US 🇨🇦 CA | Platinum AGMBCI Group: 49 | View on Amazon |
| MOTORCRAFT | BAGM49H8 | 🇺🇸 US 🇨🇦 CA | Tested Tough AGMBCI Group: 49/H8 or BCI Group 49 | View on Amazon |
| MOTORCRAFT | BAGM95RH9 | 🇺🇸 US 🇨🇦 CA | Tested Tough AGMBCI Group 95R or BCI Group: 95R/H9 | View on Amazon |
| P1MAX | PMAGMH849 | 🇺🇸 US 🇨🇦 CA | BCI Group 49 AGM850 CCA | View on Amazon |
| P1MAX | PMAGMH995R | 🇺🇸 US 🇨🇦 CA | BCI Group 95R AGM950 CCA | View on Amazon |
Performance AGM (Extended Life + Increased Power)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FULLRIVER | FT89049 | 🇺🇸 US 🇨🇦 CA | 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.
18 Battery parts for the 2021 BMW 540I come from 9 brands — DEKA, ACDELCO, FVP and 6 other brands. The "Popular" part is DEKA 9A49.
In the AGM (Extended Life) grade, DEKA, ACDELCO, FVP and 5 other brands supply 17 parts: grouped under the catalog's "AGM (Extended Life)" designation — the notes column spells out what sets them apart. A representative part number is DEKA 9A49.
In the Performance AGM (Extended Life + Increased Power) grade, FULLRIVER supplies 1 part: grouped under the catalog's "Performance AGM (Extended Life + Increased Power)" designation — the notes column spells out what sets them apart. A representative part number is FULLRIVER FT89049.
Lighting Control Module (LCM)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MARELLI | LRE568 | 🇺🇸 US 🇨🇦 CA | LED | View on Amazon |
| MARELLI | LRE570 | 🇺🇸 US 🇨🇦 CA | LED | View on Amazon |
| VEMO | V20730307 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the modules that control the exterior lighting.
3 Lighting Control Module (LCM) parts are listed for the 2021 BMW 540I, from MARELLI and VEMO.
This group includes MARELLI LRE568, MARELLI LRE570 and VEMO V20730307.
Parking Aid Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Popular | 684134 | 🇺🇸 US 🇨🇦 CA | Black | View on Amazon |
| STANDARD MOTOR PRODUCTS Popular | PPS120 | 🇺🇸 US 🇨🇦 CA | Black | View on Amazon |
| BOSCH | F00E270801 | 🇺🇸 US 🇨🇦 CA | Fits Rearwith Automated Parking System | View on Amazon |
| BOSCH | F00E270805 | 🇺🇸 US 🇨🇦 CA | Front Outerwith Automated Parking System | View on Amazon |
| MARELLI | SDP056 | 🇺🇸 US 🇨🇦 CA | Front | View on Amazon |
| MARELLI | SDP125 | 🇺🇸 US 🇨🇦 CA | Fits Right | View on Amazon |
| STANDARD MOTOR PRODUCTS | PPS183 | 🇺🇸 US 🇨🇦 CA | Black | View on Amazon |
| TECHPRO | BM1075100 | 🇺🇸 US 🇨🇦 CA | 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.
8 Parking Aid Sensor parts are listed for the 2021 BMW 540I, from STANDARD MOTOR PRODUCTS, BOSCH, MARELLI and 2 other brands. DORMAN 684134 carries the "Popular" badge.
Part numbers include DORMAN 684134, STANDARD MOTOR PRODUCTS PPS120 and BOSCH F00E270801, among others listed above.
Speed Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 5055510 | 🇺🇸 US 🇨🇦 CA | Vehicle Speed | View on Amazon |
This table covers the speed sensors on the transmission, transfer case or ABS ring. Typical signs include a dead speedometer, harsh transmission shifts, or a code for vehicle speed. Inspect the tone wheel and the connector before replacing the sensor.
This group shows a single part: DORMAN 5055510.
Starter Motor
New
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAI GLOBAL | 31413N | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Remanufactured
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP | 12883 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| PURE ENERGY | 12883 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| REMY | 16420 | 🇺🇸 US 🇨🇦 CA | 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.
4 Starter Motor parts are listed for the 2021 BMW 540I, from WAI GLOBAL, FVP, PURE ENERGY and 1 other brand.
In the New grade, WAI GLOBAL supplies 1 part: brand-new units rather than rebuilt ones. A representative part number is WAI GLOBAL 31413N.
In the Remanufactured grade, FVP, PURE ENERGY and REMY supply 3 parts: factory-rebuilt units with new wear components. A representative part number is FVP 12883.
This group includes WAI GLOBAL 31413N and FVP 12883 and the remaining parts above.
Buying Electrical Parts for a 2021 BMW 540I
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 3.0L L6 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 Parking Aid Sensor .
Frequently Asked Questions
How many electrical parts fit the 2021 BMW 540I?
Our catalog currently lists 34 electrical parts for the 2021 BMW 540I across 5 subcategories and 17 brands, covering the 3.0L L6 Turbocharged engine. Each part is matched to the engine(s) it fits.
What are the signs of electrical problems on a 2021 BMW 540I?
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 540I 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 540I?
Every part on this page is matched to the 3.0L L6 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 540I
Electrical Parts for Other BMW 540I 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.