The 2021 Audi R8 has 11 electrical switch & relay parts with verified fitment on this page — 6 part types and 8 brands, covering the 5.2L V10 engine. Each part includes a manufacturer part number and application notes.
On the 2021 Audi R8, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches. 8 parts of the 11 listed are Oil Pressure Sender / Switch (5 parts), Horn Relay (2 parts) and A/C Refrigerant Pressure Switch (1 part). The other 3 part types cover the remaining 3 parts.
Every part on this page is matched to the 5.2L V10 — the only engine offered in the 2021 Audi R8.
The most listed brands for 2021 Audi R8 electrical switch & relay parts are WELLS (4 parts), FOUR SEASONS (1 part) and HELLA (1 part), plus 5 more brands. Quality grades include Standard Replacement and Economy.
1 part on this 2021 Audi R8 page carries a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — BECK/ARNLEY 2011987 (Oil Pressure Sender / Switch). Click any part number to see every vehicle that part fits.
A/C Refrigerant Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FOUR SEASONS | 37427 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Pressure Switch | 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.
This group shows a single part: FOUR SEASONS 37427.
Brake Light Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS | 1S10938 | 🇺🇸 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.
This group shows a single part: WELLS 1S10938.
Horn Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA | 965453801 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 5-pin connector | View on Amazon |
| WELLS | 1R2303 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Mounting Hardware Included: No | View on Amazon |
This table covers the relays that control the Horn 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.
2 Horn Relay parts are listed for the 2021 Audi R8, from HELLA and WELLS.
Part numbers include HELLA 965453801 and WELLS 1R2303.
Ignition Starter Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS | 1S17872 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 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.
One part is listed for the 2021 Audi R8 — WELLS 1S17872.
Multi-Function Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BOSCH | 0986AH0080 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi-Purpose Relay | View on Amazon |
This table covers the relays that control the Multi-Function 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: BOSCH 0986AH0080.
Oil Pressure Sender / Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WALKER PRODUCTS | 2561078 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY Popular | 2011987 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Light | View on Amazon |
| ROSTRA | 501405 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| STANDARD MOTOR PRODUCTS | PS488 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Black | View on Amazon |
| WELLS | 1S10850 | 🇺🇸 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 Audi R8 come from 5 brands — WALKER PRODUCTS, BECK/ARNLEY, ROSTRA and 2 other brands. The "Popular" part is BECK/ARNLEY 2011987.
The Economy section lists 1 option from WALKER PRODUCTS — the catalog's value-priced group. WALKER PRODUCTS 2561078 is listed in this group.
In the Standard Replacement grade, BECK/ARNLEY, ROSTRA, STANDARD MOTOR PRODUCTS and 1 other brand supply 4 parts: built to original-equipment specification. A representative part number is BECK/ARNLEY 2011987.
Listed part numbers: BECK/ARNLEY 2011987, WALKER PRODUCTS 2561078 and ROSTRA 501405, plus the other parts above.
Buying Electrical Switch & Relay Parts for a 2021 Audi R8
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 5.2L V10 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: Oil Pressure Sender / Switch and Horn Relay .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2021 Audi R8?
Our catalog currently lists 11 electrical switch & relay parts for the 2021 Audi R8 across 6 subcategories and 8 brands, covering the 5.2L V10 engine. Each part is matched to the engine(s) it fits.
What are the signs of electrical switch & relay problems on a 2021 Audi R8?
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 Audi R8 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 Audi R8?
Every part on this page is matched to the 5.2L V10 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 Audi R8
Electrical Switch & Relay Parts for Other Audi R8 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.