16 Electrical switch & relay parts are listed for the 2021 BMW I3S, in 7 part types, covering both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS. Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 2021 BMW I3S, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches. Most of the listed parts are Brake Light Switch (4 parts), Power Window Switch (4 parts) and A/C Refrigerant Pressure Switch (3 parts). The other 4 part types cover the remaining 5 parts.
The 2021 BMW I3S was sold with both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS. 13 parts fit every engine; the other 3 are engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2021 BMW I3S electrical switch & relay parts are STANDARD MOTOR PRODUCTS (3 parts), VEMO (3 parts) and WELLS (3 parts), plus 6 more brands. Quality grades include Standard Replacement and Economy.
Each part number listed for the 2021 BMW I3S 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 I3S engines | 20997 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Pressure Switch | View on Amazon |
| REIN Fits: 647cc L2 ELECTRIC/GAS | ACS0243P | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| UAC Fits: all 2021 I3S 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 for the 2021 BMW I3S come from 3 brands — FOUR SEASONS, REIN and UAC. 2 parts fit every engine; the other 1 is engine-specific.
Listed part numbers: FOUR SEASONS 20997, REIN ACS0243P and UAC SW11170C.
ABS Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: all 2021 I3S engines | RY776 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Terminal Quantity: 4 | View on Amazon |
This table covers the relays that control the ABS circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.
This group shows a single part: STANDARD MOTOR PRODUCTS RY776.
Brake Light Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO Fits: all 2021 I3S engines | V20730151 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY Fits: all 2021 I3S engines | 2012711 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| STANDARD MOTOR PRODUCTS Fits: all 2021 I3S engines | SLS541 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| WELLS Fits: all 2021 I3S 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 for the 2021 BMW I3S come from 4 brands — VEMO, BECK/ARNLEY, STANDARD MOTOR PRODUCTS and 1 other brand. Every part fits both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS.
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.
Oil Pressure Sender / Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HOLSTEIN Fits: 647cc L2 ELECTRIC/GAS | 2OPS0048 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY Fits: 647cc L2 ELECTRIC/GAS | 2011515 | 🇺🇸 US 🇨🇦 CA | with Light | 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.
2 Oil Pressure Sender / Switch parts for the 2021 BMW I3S come from 2 brands — HOLSTEIN and BECK/ARNLEY.
The Economy section: 1 option from HOLSTEIN. HOLSTEIN 2OPS0048 is listed in this group.
Standard Replacement: 1 part, from BECK/ARNLEY. A representative part number is BECK/ARNLEY 2011515.
Part numbers include HOLSTEIN 2OPS0048 and BECK/ARNLEY 2011515.
Power Window Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: all 2021 I3S engines | DWS2007 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Black | View on Amazon |
| VEMO Fits: all 2021 I3S engines | V20730085 | 🇺🇸 US 🇨🇦 CA | Right | View on Amazon |
| WELLS Fits: all 2021 I3S engines | 1S16299 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear | View on Amazon |
| WELLS Fits: all 2021 I3S engines | 1S17183 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Left | 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.
4 Power Window Switch parts for the 2021 BMW I3S come from 3 brands — WELLS, STANDARD MOTOR PRODUCTS and VEMO. Every part fits both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS.
Listed part numbers: STANDARD MOTOR PRODUCTS DWS2007, VEMO V20730085 and WELLS 1S16299, plus the other parts above.
Radiator Fan Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ÜRO PARTS Fits: all 2021 I3S engines | 64116930015 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Sensor | View on Amazon |
This table covers the Radiator Fan 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: ÜRO PARTS 64116930015.
Trunk Lid / Tailgate Release Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO Fits: all 2021 I3S engines | V20730310 | 🇺🇸 US 🇨🇦 CA | 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.
One part is listed for the 2021 BMW I3S — VEMO V20730310.
Buying Electrical Switch & Relay Parts for a 2021 BMW I3S
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 Power Window Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2021 BMW I3S?
Our catalog currently lists 16 electrical switch & relay parts for the 2021 BMW I3S across 7 subcategories and 9 brands, covering both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS. Each part is matched to the engine(s) it fits.
Do electrical switch & relay parts differ between 2021 BMW I3S engines?
Some do. 13 parts fit every engine; the other 3 are 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 I3S?
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 I3S 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 I3S?
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 I3S
Electrical Switch & Relay Parts for Other BMW I3S Years
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