The 2020 Audi A8 has 23 electrical switch & relay parts with verified fitment on this page — 13 part types and 10 brands, covering all 3 engine options (3.0L V6 ELECTRIC/GAS Turbocharged, 3.0L V6 Turbocharged and 4.0L V8 Turbocharged). Each part includes a manufacturer part number and application notes.
On the 2020 Audi A8, 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 Oil Pressure Sender / Switch (9 parts), A/C Refrigerant Pressure Switch (2 parts) and Power Window Switch (2 parts). The other 10 part types cover the remaining 10 parts.
The 2020 Audi A8 was sold with 3 engines. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2020 Audi A8 electrical switch & relay parts are HELLA (6 parts), WELLS (4 parts) and VEMO (4 parts), plus 7 more brands. Quality grades include Standard Replacement and Economy.
1 part on this 2020 Audi A8 page carries a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — HELLA 003259971 (Oil Pressure Sender / Switch). Click any part number to see every vehicle that part fits.
A/C Condenser Fan Motor Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: 4.0L V8 Turbocharged | 933332451 | 🇺🇸 US 🇨🇦 CA | 4-pin connector | View on Amazon |
This table covers the relays that control the A/C Condenser Fan Motor 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: HELLA 933332451.
A/C Refrigerant Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FOUR SEASONS Fits: 4.0L V8 Turbocharged | 37427 | 🇺🇸 US 🇨🇦 CA | Pressure Switch | View on Amazon |
| UAC Fits: 4.0L V8 Turbocharged | SW11224C | 🇺🇸 US 🇨🇦 CA | 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 for the 2020 Audi A8 come from 2 brands — FOUR SEASONS and UAC.
This group includes FOUR SEASONS 37427 and UAC SW11224C.
A/C Thermo Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GPD Fits: 4.0L V8 Turbocharged | 1713414 | 🇺🇸 US 🇨🇦 CA | 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.
One part is listed for the 2020 Audi A8 — GPD 1713414.
Accessory Power Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: 4.0L V8 Turbocharged | 933332451 | 🇺🇸 US 🇨🇦 CA | 4-pin connector | View on Amazon |
This table covers the relays that control the Accessory Power 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 2020 Audi A8 — HELLA 933332451.
Brake Light Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: 4.0L V8 Turbocharged | 1S14224 | 🇺🇸 US 🇨🇦 CA | 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 1S14224.
Fog / Driving Lamp Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: 4.0L V8 Turbocharged | 933332451 | 🇺🇸 US 🇨🇦 CA | 4-pin connector | View on Amazon |
This table covers the relays that control the Fog / Driving Lamp 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: HELLA 933332451.
Fuel Pump / Circuit Opening Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: 4.0L V8 Turbocharged | 933332451 | 🇺🇸 US 🇨🇦 CA | 4-pin connector | View on Amazon |
This table covers the relays that control the Fuel Pump / Circuit Opening 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: HELLA 933332451.
Horn Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: 4.0L V8 Turbocharged | 1R2303 | 🇺🇸 US 🇨🇦 CA | 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.
One part is listed for the 2020 Audi A8 — WELLS 1R2303.
Multi-Function Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: 4.0L V8 Turbocharged | 1R1007 | 🇺🇸 US 🇨🇦 CA | 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.
This group shows a single part: WELLS 1R1007.
Oil Pressure Sender / Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WALKER PRODUCTS Fits: 4.0L V8 Turbocharged | 2561150 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Popular Fits: 4.0L V8 Turbocharged | 003259971 | 🇺🇸 US 🇨🇦 CA | 1-Pin ConnectorColor: Black or Turquoise | View on Amazon |
| FACET Fits: 4.0L V8 Turbocharged | 250053 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| ROSTRA Fits: 4.0L V8 Turbocharged | 501543 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| STANDARD MOTOR PRODUCTS Fits: 4.0L V8 Turbocharged | PS669 | 🇺🇸 US 🇨🇦 CA | Finish: Chrome, Plastic | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 4.0L V8 Turbocharged | PS778 | 🇺🇸 US 🇨🇦 CA | Connector Type: Plug InFinish: Metal, Plastic | View on Amazon |
| WELLS Fits: 4.0L V8 Turbocharged | 1S12102 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GPD Fits: 4.0L V8 Turbocharged | 1816565 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| VEMO Fits: 4.0L V8 Turbocharged | V10730311 | 🇺🇸 US 🇨🇦 CA | 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.
9 Oil Pressure Sender / Switch parts for the 2020 Audi A8 come from 8 brands — STANDARD MOTOR PRODUCTS, WALKER PRODUCTS, HELLA and 5 other brands. The "Popular" part is HELLA 003259971.
The Economy section lists 1 option from WALKER PRODUCTS — the catalog's value-priced group. WALKER PRODUCTS 2561150 is listed in this group.
In the Standard Replacement grade, STANDARD MOTOR PRODUCTS, HELLA, FACET and 2 other brands supply 6 parts: built to original-equipment specification. A representative part number is HELLA 003259971.
2 further parts sit outside the graded sections, with the same engine-level match.
Part numbers include HELLA 003259971, WALKER PRODUCTS 2561150 and FACET 250053, among others listed above.
Power Window Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO Fits: 4.0L V8 Turbocharged | V10730719 | 🇺🇸 US 🇨🇦 CA | Fits Front Right | View on Amazon |
| VEMO Fits: 4.0L V8 Turbocharged | V10730728 | 🇺🇸 US 🇨🇦 CA | 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.
2 Power Window Switch parts for the 2020 Audi A8 come from VEMO.
Part numbers include VEMO V10730719 and VEMO V10730728.
Radiator Fan Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: 4.0L V8 Turbocharged | 933332451 | 🇺🇸 US 🇨🇦 CA | 4-pin connector | View on Amazon |
This table covers the relays that control the Radiator Fan 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 2020 Audi A8 — HELLA 933332451.
Trunk Lid / Tailgate Release Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO Fits: 4.0L V8 Turbocharged | V10730458 | 🇺🇸 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 2020 Audi A8 — VEMO V10730458.
Buying Electrical Switch & Relay Parts for a 2020 Audi A8
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. Every electrical switch & relay part here is 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: Oil Pressure Sender / Switch and A/C Refrigerant Pressure Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2020 Audi A8?
Our catalog currently lists 23 electrical switch & relay parts for the 2020 Audi A8 across 13 subcategories and 10 brands, covering all 3 engine options (3.0L V6 ELECTRIC/GAS Turbocharged, 3.0L V6 Turbocharged and 4.0L V8 Turbocharged). Each part is matched to the engine(s) it fits.
Do electrical switch & relay parts differ between 2020 Audi A8 engines?
Yes. Every electrical switch & relay part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. 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 2020 Audi A8?
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 2020 Audi A8 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 2020 Audi A8?
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 2020 Audi A8
Electrical Switch & Relay Parts for Other Audi A8 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.