The 2021 BMW Z4 has 13 electrical switch & relay parts with verified fitment on this page — 5 part types and 9 brands, covering both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged. Each part includes a manufacturer part number and application notes.
On the 2021 BMW Z4, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches. 11 parts of the 13 listed are Brake Light Switch (4 parts), Oil Pressure Sender / Switch (4 parts) and A/C Refrigerant Pressure Switch (3 parts). The other 2 part types cover the remaining 2 parts.
The 2021 BMW Z4 was sold with both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged. 12 parts fit every engine; the other 1 is engine-specific. Each part shows which engine(s) it fits.
9 brands supply electrical switch & relay parts for the 2021 BMW Z4, led by VEMO (3 parts), STANDARD MOTOR PRODUCTS (2 parts) and WELLS (2 parts), plus 6 more brands. Quality grades include Standard Replacement and Economy.
Each part number listed for the 2021 BMW Z4 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 Z4 engines | 20997 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Pressure Switch | View on Amazon |
| REIN Fits: all 2021 Z4 engines | ACS0243P | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| UAC Fits: all 2021 Z4 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 Z4, from FOUR SEASONS, REIN and UAC. All of them fit every engine offered in the 2021 Z4.
Part numbers include FOUR SEASONS 20997, REIN ACS0243P and UAC SW11170C.
Brake Light Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO Fits: all 2021 Z4 engines | V20730151 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY Fits: all 2021 Z4 engines | 2012711 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| STANDARD MOTOR PRODUCTS Fits: all 2021 Z4 engines | SLS541 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| WELLS Fits: all 2021 Z4 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.
4 Brake Light Switch parts are listed for the 2021 BMW Z4, from VEMO, BECK/ARNLEY, STANDARD MOTOR PRODUCTS and 1 other brand. All of them fit every engine offered in the 2021 Z4.
In the Economy grade, VEMO supplies 1 part: the catalog's value-priced group. A representative part number is VEMO V20730151.
The Standard Replacement section lists 3 options from BECK/ARNLEY, STANDARD MOTOR PRODUCTS and WELLS — built to original-equipment specification. BECK/ARNLEY 2012711 is listed in this group.
Listed part numbers: VEMO V20730151, BECK/ARNLEY 2012711 and STANDARD MOTOR PRODUCTS SLS541, plus the other parts above.
Oil Pressure Sender / Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FACET Fits: all 2021 Z4 engines | 250015 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| GPD Fits: all 2021 Z4 engines | 1816559 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Light | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: all 2021 Z4 engines | PS754 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| WELLS Fits: all 2021 Z4 engines | 1S16103 | 🇺🇸 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.
4 Oil Pressure Sender / Switch parts are listed for the 2021 BMW Z4, from FACET, GPD, STANDARD MOTOR PRODUCTS and 1 other brand. All of them fit every engine offered in the 2021 Z4.
This group includes FACET 250015, GPD 1816559 and STANDARD MOTOR PRODUCTS PS754 and the remaining parts above.
Power Window Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO Fits: all 2021 Z4 engines | V20730271 | 🇺🇸 US 🇨🇦 CA | RightColor: 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 Z4 — VEMO V20730271.
Trunk Lid / Tailgate Release Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO Fits: 3.0L L6 Turbocharged | V20730310 | 🇲🇽 MX | 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 Z4
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. Some electrical switch & relay parts fit every engine; others are 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: Brake Light Switch and Oil Pressure Sender / Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2021 BMW Z4?
Our catalog currently lists 13 electrical switch & relay parts for the 2021 BMW Z4 across 5 subcategories and 9 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 Z4 engines?
Some do. 12 parts fit every engine; the other 1 is engine-specific. Each row (and the filter at the top) shows which. 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 Z4?
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 Z4 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 Z4?
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 Z4
Electrical Switch & Relay Parts for Other BMW Z4 Years
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