The 2021 BMW X3 has 16 electrical switch & relay parts with verified fitment on this page — 5 part types and 9 brands, covering all 3 engine options (2.0L L4 ELECTRIC/GAS Turbocharged, 2.0L L4 Turbocharged and 3.0L L6 Turbocharged). Each part includes a manufacturer part number and application notes.
On the 2021 BMW X3, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches. 12 parts of the 16 listed are Oil Pressure Sender / Switch (5 parts), Brake Light Switch (4 parts) and A/C Refrigerant Pressure Switch (3 parts). The other 2 part types cover the remaining 4 parts.
The 2021 BMW X3 was sold with 3 engines. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2021 BMW X3 electrical switch & relay parts are WELLS (7 parts), STANDARD MOTOR PRODUCTS (2 parts) and FOUR SEASONS (1 part), plus 6 more brands. Quality grades include Standard Replacement and Economy.
Each part number listed for the 2021 BMW X3 opens a page with every vehicle that part fits.
A/C Refrigerant Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FOUR SEASONS Fits: 2.0L L4 Turbocharged, 3.0L L6 Turbocharged | 20997 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Pressure Switch | View on Amazon |
| REIN Fits: 2.0L L4 Turbocharged, 3.0L L6 Turbocharged | ACS0243P | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| UAC Fits: 2.0L L4 Turbocharged, 3.0L L6 Turbocharged | 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 for the 2021 BMW X3 come from 3 brands — FOUR SEASONS, REIN and UAC.
Listed part numbers: FOUR SEASONS 20997, REIN ACS0243P and UAC SW11170C.
Brake Light Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO Fits: 2.0L L4 Turbocharged, 3.0L L6 Turbocharged | V20730151 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY Fits: 2.0L L4 Turbocharged, 3.0L L6 Turbocharged | 2012711 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| STANDARD MOTOR PRODUCTS Fits: 2.0L L4 Turbocharged, 3.0L L6 Turbocharged | SLS541 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| WELLS Fits: 2.0L L4 Turbocharged, 3.0L L6 Turbocharged | 1S12667 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 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.
4 Brake Light Switch parts for the 2021 BMW X3 come from 4 brands — VEMO, BECK/ARNLEY, STANDARD MOTOR PRODUCTS and 1 other brand.
The Economy section lists 1 option from VEMO — the catalog's value-priced group. VEMO V20730151 is listed in this group.
In the Standard Replacement grade, BECK/ARNLEY, STANDARD MOTOR PRODUCTS and WELLS supply 3 parts: built to original-equipment specification. A representative part number is BECK/ARNLEY 2012711.
This group includes VEMO V20730151, BECK/ARNLEY 2012711 and STANDARD MOTOR PRODUCTS SLS541 and the remaining parts above.
Headlamp Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: 2.0L L4 Turbocharged, 3.0L L6 Turbocharged | 1S18201 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with LED Fog Lights | View on Amazon |
| WELLS Fits: 2.0L L4 Turbocharged, 3.0L L6 Turbocharged | 1S18217 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | without LED Fog Lights | 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.
WELLS supplies both parts for the 2021 BMW X3.
This group includes WELLS 1S18201 and WELLS 1S18217.
Ignition Starter Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: 2.0L L4 Turbocharged, 3.0L L6 Turbocharged | 1S17770 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Push Button Switchwith Start/Stop Feature | View on Amazon |
| WELLS Fits: 2.0L L4 Turbocharged, 3.0L L6 Turbocharged | 1S17772 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Push Button Switchwithout Start/Stop Feature | 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.
WELLS supplies both parts for the 2021 BMW X3.
Part numbers include WELLS 1S17770 and WELLS 1S17772.
Oil Pressure Sender / Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FACET Fits: 2.0L L4 Turbocharged | 250015 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| GPD Fits: 2.0L L4 Turbocharged, 3.0L L6 Turbocharged | 1816559 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Light | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 2.0L L4 Turbocharged, 3.0L L6 Turbocharged | PS754 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Light | View on Amazon |
| WELLS Fits: 2.0L L4 Turbocharged | 1S16103 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| WELLS Fits: 3.0L L6 Turbocharged | 1S15907 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 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.
5 Oil Pressure Sender / Switch parts for the 2021 BMW X3 come from 4 brands — WELLS, FACET, GPD and 1 other brand.
Listed part numbers: FACET 250015, GPD 1816559 and STANDARD MOTOR PRODUCTS PS754, plus the other parts above.
Buying Electrical Switch & Relay Parts for a 2021 BMW X3
On this vehicle, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches.
- Match the engine first. Every electrical switch & relay part here is engine-specific; each row shows which engine(s) it fits.
- 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: Oil Pressure Sender / Switch and Brake Light Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2021 BMW X3?
Our catalog currently lists 16 electrical switch & relay parts for the 2021 BMW X3 across 5 subcategories and 9 brands, covering all 3 engine options (2.0L L4 ELECTRIC/GAS Turbocharged, 2.0L L4 Turbocharged and 3.0L L6 Turbocharged). Each part is matched to the engine(s) it fits.
Do electrical switch & relay parts differ between 2021 BMW X3 engines?
Yes. Every electrical switch & relay part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of electrical switch & relay problems on a 2021 BMW X3?
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 X3 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 X3?
First match the engine — each row shows which engine(s) the part fits. 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 X3
Electrical Switch & Relay Parts for Other BMW X3 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.