This page lists 16 electrical switch & relay parts for the 2021 Audi S8, across 9 part types, covering the 4.0L V8 Turbocharged engine. Every part shows its brand, manufacturer part number and fitment notes.
On the 2021 Audi S8, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches. 10 parts of the 16 listed are Oil Pressure Sender / Switch (6 parts), A/C Refrigerant Pressure Switch (2 parts) and Power Window Switch (2 parts). The other 6 part types cover the remaining 6 parts.
The 2021 Audi S8 came with a single engine, the 4.0L V8 Turbocharged, and every part is verified against it.
9 brands supply electrical switch & relay parts for the 2021 Audi S8, led by VEMO (5 parts), WELLS (4 parts) and FOUR SEASONS (1 part), plus 6 more brands. Quality grades include Standard Replacement and Economy.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2021 Audi S8. 2 parts have it, including STANDARD MOTOR PRODUCTS PS673 (Oil Pressure Sender / Switch) and WELLS 1S12104 (Oil Pressure Sender / Switch). Each part number opens a page with 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 |
| UAC | SW11224C | 🇺🇸 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.
2 A/C Refrigerant Pressure Switch parts are listed for the 2021 Audi S8, from FOUR SEASONS and UAC.
Listed part numbers: FOUR SEASONS 37427 and UAC SW11224C.
A/C Thermo Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GPD | 1713414 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Thermistor | View on Amazon |
This table covers the A/C Thermo 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: GPD 1713414.
Brake Light Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS | 1S14224 | 🇺🇸 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.
One part is listed for the 2021 Audi S8 — WELLS 1S14224.
Horn Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| 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.
This group shows a single part: WELLS 1R2303.
Multi-Function Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS | 1R1007 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Mounting Hardware Included: No | 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.
One part is listed for the 2021 Audi S8 — WELLS 1R1007.
Oil Pressure Sender / Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WALKER PRODUCTS | 2561150 | 🇺🇸 US 🇲🇽 MX | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular | PS673 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Connector Type: Socket | View on Amazon |
| WELLS Popular | 1S12104 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| HELLA | 003259971 | 🇺🇸 US 🇲🇽 MX | 1-Pin ConnectorColor: Black or Turquoise | View on Amazon |
| ROSTRA | 501409 | 🇺🇸 US 🇲🇽 MX | with 1 TerminalsBlue Connector | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO | V10730311 | 🇺🇸 US 🇲🇽 MX | 3 PINS | 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.
6 Oil Pressure Sender / Switch parts are listed for the 2021 Audi S8, from WALKER PRODUCTS, STANDARD MOTOR PRODUCTS, WELLS and 3 other brands. STANDARD MOTOR PRODUCTS PS673 carries the "Popular" badge.
In the Economy grade, WALKER PRODUCTS supplies 1 part: the catalog's value-priced group. A representative part number is WALKER PRODUCTS 2561150.
The Standard Replacement section lists 4 options from STANDARD MOTOR PRODUCTS, WELLS, HELLA and 1 other brand — built to original-equipment specification. STANDARD MOTOR PRODUCTS PS673 is listed in this group.
1 ungrouped part is not assigned to a grade, with the same engine-level match.
Listed part numbers: STANDARD MOTOR PRODUCTS PS673, WALKER PRODUCTS 2561150 and WELLS 1S12104, plus the other parts above.
Power Window Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO | V10730719 | 🇺🇸 US 🇲🇽 MX | Fits Front Right | View on Amazon |
| VEMO | V10730728 | 🇺🇸 US 🇲🇽 MX | Front LeftSwitch Panel Assembly | 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.
VEMO supplies both parts for the 2021 Audi S8.
This group includes VEMO V10730719 and VEMO V10730728.
Trunk Lid / Tailgate Release Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO | V10730458 | 🇺🇸 US 🇲🇽 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 V10730458.
Turn Signal Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO | V10800003 | 🇺🇸 US 🇲🇽 MX | 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 Audi S8 — VEMO V10800003.
Buying Electrical Switch & Relay Parts for a 2021 Audi S8
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 4.0L V8 Turbocharged 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 A/C Refrigerant Pressure Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2021 Audi S8?
Our catalog currently lists 16 electrical switch & relay parts for the 2021 Audi S8 across 9 subcategories and 9 brands, covering the 4.0L V8 Turbocharged engine. Each part is matched to the engine(s) it fits.
What are the signs of electrical switch & relay problems on a 2021 Audi S8?
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 S8 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 S8?
Every part on this page is matched to the 4.0L V8 Turbocharged 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 S8
Electrical Switch & Relay Parts for Other Audi S8 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.