The 2021 BMW M550I has 14 electrical switch & relay parts with verified fitment on this page — 7 part types and 8 brands, covering the 4.4L V8 Turbocharged engine. Each part includes a manufacturer part number and application notes.
On the 2021 BMW M550I, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches. 9 parts of the 14 listed are A/C Refrigerant Pressure Switch (3 parts), Headlamp Switch (3 parts) and Oil Pressure Sender / Switch (3 parts). The other 4 part types cover the remaining 5 parts.
The 2021 BMW M550I came with a single engine, the 4.4L V8 Turbocharged, and every part is verified against it.
8 brands supply electrical switch & relay parts for the 2021 BMW M550I, led by WELLS (6 parts), VEMO (2 parts) and FOUR SEASONS (1 part), plus 5 more brands. Quality grades include Economy and Standard Replacement.
Each part number listed for the 2021 BMW M550I opens a page with every vehicle that part fits.
A/C Refrigerant Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FOUR SEASONS | 20997 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Pressure Switch | View on Amazon |
| REIN | ACS0243P | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | M550i xDrive | View on Amazon |
| UAC | SW11170C | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Pressure Transducer | View on Amazon |
This table covers the pressure switches on the A/C circuit. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
3 A/C Refrigerant Pressure Switch parts are listed for the 2021 BMW M550I, from FOUR SEASONS, REIN and UAC.
Part numbers include FOUR SEASONS 20997, REIN ACS0243P and UAC SW11170C.
Brake Light Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 920458 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS | 1S12667 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | M550i xDrive | View on Amazon |
This table covers the pedal-mounted switch that turns on the brake lamps. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
2 Brake Light Switch parts are listed for the 2021 BMW M550I, from DORMAN and WELLS.
In the Economy grade, DORMAN supplies 1 part: the catalog's value-priced group. A representative part number is DORMAN 920458.
The Standard Replacement section lists 1 option from WELLS — built to original-equipment specification. WELLS 1S12667 is listed in this group.
Listed part numbers: DORMAN 920458 and WELLS 1S12667.
Headlamp Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS | 1S18203 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | M550i xDrivewithout GT Package | View on Amazon |
| WELLS | 1S18207 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | M550i xDrivewithout GT Package | View on Amazon |
| WELLS | 1S18210 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | M550i xDrivewithout GT Package | View on Amazon |
This table covers the column or dash switches that control the exterior lamps. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
3 Headlamp Switch parts for the 2021 BMW M550I come from WELLS.
Part numbers include WELLS 1S18203, WELLS 1S18207 and WELLS 1S18210.
Ignition Starter Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS | 1S17774 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | M550i xDrivewith Push Button Switch | View on Amazon |
This table covers the ignition switches that feed the starter circuit. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
This group shows a single part: WELLS 1S17774.
Oil Pressure Sender / Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FACET | 250015 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | M550i xDrive | View on Amazon |
| STANDARD MOTOR PRODUCTS | PS754 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | M550i xDrivewith Light | View on Amazon |
| WELLS | 1S16103 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | M550i xDrive | View on Amazon |
This table covers the senders and switches that report oil pressure to the gauge or lamp. Typical signs include a lamp that stays on, or a gauge that never moves. Confirm power and ground at the connector before replacing the sender or switch.
3 Oil Pressure Sender / Switch parts are listed for the 2021 BMW M550I, from FACET, STANDARD MOTOR PRODUCTS and WELLS.
Listed part numbers: FACET 250015, STANDARD MOTOR PRODUCTS PS754 and WELLS 1S16103.
Power Window Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO | V20730271 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits RearM550i xDrive | View on Amazon |
This table covers the switches that command each window motor. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
One part is listed for the 2021 BMW M550I — VEMO V20730271.
Trunk Lid / Tailgate Release Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO | V20730310 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | M550i xDrive | View on Amazon |
This table covers the Trunk Lid / Tailgate Release switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
This group shows a single part: VEMO V20730310.
Buying Electrical Switch & Relay Parts for a 2021 BMW M550I
On this vehicle, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches.
- 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, inspect the connector terminals behind any failed switch — heat damage there will kill the new part too.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: A/C Refrigerant Pressure Switch and Headlamp Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2021 BMW M550I?
Our catalog currently lists 14 electrical switch & relay parts for the 2021 BMW M550I across 7 subcategories and 8 brands, covering the 4.4L V8 Turbocharged engine. Each part is matched to the engine(s) it fits.
What are the signs of electrical switch & relay problems on a 2021 BMW M550I?
Common symptoms include accessories that work intermittently, a click without action, or one function dead while its fuse tests fine. 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, inspect the connector terminals behind any failed switch — heat damage there will kill the new part too.
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 M550I 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 M550I?
Every part on this page is matched to the 4.4L V8 Turbocharged engine. Then swap a suspect relay with an identical known-good one from the fuse box before buying — it is the fastest diagnostic there is. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 BMW M550I
Electrical Switch & Relay Parts for Other BMW M550I Years
Switch vehicle or jump to a subcategory
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.