The 2021 BMW X4 has 14 electrical switch & relay parts with verified fitment on this page — 7 part types and 8 brands, covering both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged. Each part includes a manufacturer part number and application notes.
The switch and relay system on the 2021 BMW X4 covers the switches, relays and flashers that route power to everything the driver touches. The largest groups are A/C Refrigerant Pressure Switch (3 parts), Oil Pressure Sender / Switch (3 parts) and Brake Light Switch (2 parts). The other 4 part types cover the remaining 6 parts.
The 2021 BMW X4 was sold with both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged. All 14 parts on this page fit every engine.
8 brands supply electrical switch & relay parts for the 2021 BMW X4, led by WELLS (7 parts), FOUR SEASONS (1 part) and REIN (1 part), plus 5 more brands.
Each part number listed for the 2021 BMW X4 opens a page with every vehicle that part fits.
A/C Refrigerant Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FOUR SEASONS Fits: all 2021 X4 engines | 20997 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Pressure Switch | View on Amazon |
| REIN Fits: all 2021 X4 engines | ACS0243P | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| UAC Fits: all 2021 X4 engines | 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 X4, from FOUR SEASONS, REIN and UAC. All of them fit every engine offered in the 2021 X4.
Listed part numbers: FOUR SEASONS 20997, REIN ACS0243P and UAC SW11170C.
Brake Light Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY Fits: all 2021 X4 engines | 2012711 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| WELLS Fits: all 2021 X4 engines | 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.
2 Brake Light Switch parts are listed for the 2021 BMW X4, from BECK/ARNLEY and WELLS. All of them fit every engine offered in the 2021 X4.
Listed part numbers: BECK/ARNLEY 2012711 and WELLS 1S12667.
Headlamp Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: all 2021 X4 engines | 1S18201 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with LED Fog Lights | View on Amazon |
| WELLS Fits: all 2021 X4 engines | 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.
2 Headlamp Switch parts for the 2021 BMW X4 come from WELLS. Every part fits both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged.
Listed part numbers: WELLS 1S18201 and WELLS 1S18217.
Ignition Starter Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: all 2021 X4 engines | 1S17770 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Push Button Switchwith Start/Stop Feature | View on Amazon |
| WELLS Fits: all 2021 X4 engines | 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.
2 Ignition Starter Switch parts for the 2021 BMW X4 come from WELLS. Every part fits both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged.
Listed part numbers: WELLS 1S17770 and WELLS 1S17772.
Oil Pressure Sender / Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GPD Fits: all 2021 X4 engines | 1816559 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Light | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: all 2021 X4 engines | PS754 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| WELLS Fits: all 2021 X4 engines | 1S16103 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 10mm Thread Size | 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 X4, from GPD, STANDARD MOTOR PRODUCTS and WELLS. All of them fit every engine offered in the 2021 X4.
Part numbers include GPD 1816559, STANDARD MOTOR PRODUCTS PS754 and WELLS 1S16103.
Power Window Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO Fits: all 2021 X4 engines | V20730271 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits RearColor: Black | 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 X4 — VEMO V20730271.
Turn Signal Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: all 2021 X4 engines | 1S17937 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | M40i Model | View on Amazon |
This table covers the combination / turn-signal 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.
One part is listed for the 2021 BMW X4 — WELLS 1S17937.
Buying Electrical Switch & Relay Parts for a 2021 BMW X4
On this vehicle, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches.
- You do not need to pick an engine: every electrical switch & relay part on this page fits both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged.
- 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 Oil Pressure Sender / Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2021 BMW X4?
Our catalog currently lists 14 electrical switch & relay parts for the 2021 BMW X4 across 7 subcategories and 8 brands, covering both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged. Each part is matched to the engine(s) it fits.
Do electrical switch & relay parts differ between 2021 BMW X4 engines?
No. On this page every electrical switch & relay part fits both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged. You do not need to pick an engine to choose the right row — use the notes for position and trim.
What are the signs of electrical switch & relay problems on a 2021 BMW X4?
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 X4 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 X4?
Every part on this page already fits both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged. 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 X4
Electrical Switch & Relay Parts for Other BMW X4 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.