27 Electrical switch & relay parts are listed for the 2018 Audi S5, in 9 part types, covering both the 3.0L V6 Supercharged and the 3.0L V6 Turbocharged. Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 2018 Audi S5, 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 (5 parts) and Multi-Function Relay (4 parts). The other 6 part types cover the remaining 9 parts.
The 2018 Audi S5 was sold with both the 3.0L V6 Supercharged and the 3.0L V6 Turbocharged. 16 parts fit every engine; the other 11 are engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2018 Audi S5 electrical switch & relay parts are WELLS (7 parts), VEMO (5 parts) and STANDARD MOTOR PRODUCTS (3 parts), plus 10 more brands. Quality grades include Standard Replacement and Economy.
3 parts on this 2018 Audi S5 page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including UAC SW11224C (A/C Refrigerant Pressure Switch) and HELLA 003259971 (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 |
|---|---|---|---|---|
| UAC Popular Fits: all 2018 S5 engines | SW11224C | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Pressure Transducer | View on Amazon |
| FOUR SEASONS Fits: all 2018 S5 engines | 37427 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Pressure Switch | View on Amazon |
| JAPANESE OE Fits: all 2018 S5 engines | 3ACP0018 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Sensata | View on Amazon |
| VNE Fits: all 2018 S5 engines | 4016002 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| WELLS Fits: all 2018 S5 engines | 5S16908 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 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.
5 A/C Refrigerant Pressure Switch parts for the 2018 Audi S5 come from 5 brands — UAC, FOUR SEASONS, JAPANESE OE and 2 other brands. The "Popular" part is UAC SW11224C. Every part fits both the 3.0L V6 Supercharged and the 3.0L V6 Turbocharged.
This group includes UAC SW11224C, FOUR SEASONS 37427 and JAPANESE OE 3ACP0018 and the remaining parts above.
Brake Light Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ÜRO PARTS Fits: 3.0L V6 Turbocharged | 5G0698459 | 🇺🇸 US 🇨🇦 CA | S5 Sportback | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: 3.0L V6 Turbocharged | 1S14224 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: 3.0L V6 Supercharged | 1S14224 | 🇲🇽 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.
3 Brake Light Switch parts for the 2018 Audi S5 come from 2 brands — WELLS and ÜRO PARTS.
The Economy section lists 1 option from ÜRO PARTS — the catalog's value-priced group. ÜRO PARTS 5G0698459 is listed in this group.
In the Standard Replacement grade, WELLS supplies 1 part: built to original-equipment specification. A representative part number is WELLS 1S14224.
1 further part sits outside the graded sections, with the same engine-level match.
Part numbers include ÜRO PARTS 5G0698459 and WELLS 1S14224, among others listed above.
Horn Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: all 2018 S5 engines | 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.
One part is listed for the 2018 Audi S5 — WELLS 1R2303.
Ignition Starter Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: all 2018 S5 engines | US1477 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| WELLS Fits: all 2018 S5 engines | 1S17494 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Push Button Switch | 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.
2 Ignition Starter Switch parts are listed for the 2018 Audi S5, from STANDARD MOTOR PRODUCTS and WELLS. All of them fit every engine offered in the 2018 S5.
Listed part numbers: STANDARD MOTOR PRODUCTS US1477 and WELLS 1S17494.
Multi-Function Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BOSCH Fits: all 2018 S5 engines | 0986AH0082 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi-Purpose Relay | View on Amazon |
| BOSCH Fits: all 2018 S5 engines | 0986332209 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi-Purpose Relay | View on Amazon |
| ÜRO PARTS Fits: all 2018 S5 engines | 7M0951253A | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| WELLS Fits: all 2018 S5 engines | 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.
4 Multi-Function Relay parts for the 2018 Audi S5 come from 3 brands — BOSCH, ÜRO PARTS and WELLS. Every part fits both the 3.0L V6 Supercharged and the 3.0L V6 Turbocharged.
Part numbers include BOSCH 0986AH0082, BOSCH 0986332209 and ÜRO PARTS 7M0951253A, among others listed above.
Oil Pressure Sender / Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WALKER PRODUCTS Fits: all 2018 S5 engines | 2561150 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Popular Fits: 3.0L V6 Turbocharged | 003259971 | 🇺🇸 US | 1-Pin ConnectorColor: Black or Turquoise | View on Amazon |
| STANDARD MOTOR PRODUCTS Popular Fits: all 2018 S5 engines | PS669 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Finish: Chrome, Plastic | View on Amazon |
| FACET Fits: 3.0L V6 Supercharged | 250053 | 🇲🇽 MX | View on Amazon | |
| STANDARD MOTOR PRODUCTS Fits: 3.0L V6 Supercharged | PS778 | 🇲🇽 MX | Connector Type: Plug InFinish: Metal, Plastic | View on Amazon |
| VEMO Fits: all 2018 S5 engines | V10720420 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | From 08/28/2017To 07/31/2023 | View on Amazon |
| WELLS Fits: 3.0L V6 Supercharged | 1S12102 | 🇲🇽 MX | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GPD Fits: 3.0L V6 Supercharged | 1816565 | 🇲🇽 MX | View on Amazon | |
| VEMO Fits: 3.0L V6 Turbocharged | V10730311 | 🇺🇸 US | 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 2018 Audi S5 come from 7 brands — STANDARD MOTOR PRODUCTS, VEMO, WALKER PRODUCTS and 4 other brands. The "Popular" part is HELLA 003259971. 3 parts fit every engine; the other 6 are engine-specific.
The Economy section: 1 option from WALKER PRODUCTS. WALKER PRODUCTS 2561150 is listed in this group.
Standard Replacement: 6 parts, from STANDARD MOTOR PRODUCTS, HELLA, FACET and 2 other brands. A representative part number is HELLA 003259971.
2 further parts sit outside the graded sections, with the same engine-level match.
This group includes HELLA 003259971, WALKER PRODUCTS 2561150 and STANDARD MOTOR PRODUCTS PS669 and the remaining parts above.
Power Seat Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO Fits: 3.0L V6 Turbocharged | V10730561 | 🇺🇸 US 🇨🇦 CA | ConvertibleFront Left | View on Amazon |
This table covers the Power Seat 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 2018 Audi S5 — VEMO V10730561.
Power Window Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO Fits: 3.0L V6 Turbocharged | V10730721 | 🇺🇸 US | 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.
This group shows a single part: VEMO V10730721.
Trunk Lid / Tailgate Release Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO Fits: all 2018 S5 engines | V10730458 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Coupe | 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 2018 Audi S5 — VEMO V10730458.
Buying Electrical Switch & Relay Parts for a 2018 Audi S5
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: Oil Pressure Sender / Switch and A/C Refrigerant Pressure Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2018 Audi S5?
Our catalog currently lists 27 electrical switch & relay parts for the 2018 Audi S5 across 9 subcategories and 13 brands, covering both the 3.0L V6 Supercharged and the 3.0L V6 Turbocharged. Each part is matched to the engine(s) it fits.
Do electrical switch & relay parts differ between 2018 Audi S5 engines?
Some do. 16 parts fit every engine; the other 11 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 2018 Audi S5?
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 2018 Audi S5 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 2018 Audi S5?
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 2018 Audi S5
Electrical Switch & Relay Parts for Other Audi S5 Years
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