32 Electrical switch & relay parts are listed for the 2018 Audi A6, in 15 part types, covering all 3 engine options (1.8L L4 Turbocharged, 2.0L L4 Turbocharged and 3.0L V6 Supercharged). Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 2018 Audi A6, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches. 13 parts of the 32 listed are Oil Pressure Sender / Switch (5 parts), Brake Light Switch (4 parts) and Multi-Function Relay (4 parts). The other 12 part types cover the remaining 19 parts.
The 2018 Audi A6 was sold with 3 engines. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
13 brands supply electrical switch & relay parts for the 2018 Audi A6, led by WELLS (12 parts), HELLA (5 parts) and STANDARD MOTOR PRODUCTS (4 parts), plus 10 more brands. Quality grades include Standard Replacement and Economy.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2018 Audi A6. 1 part has it: BECK/ARNLEY 2011983 (Oil Pressure Sender / Switch). Each part number opens a page with every vehicle that part fits.
A/C Condenser Fan Motor Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: 1.8L L4 Turbocharged | 933332451 | 🇲🇽 MX | 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.
One part is listed for the 2018 Audi A6 — HELLA 933332451.
A/C Refrigerant Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FOUR SEASONS Fits: 1.8L L4 Turbocharged | 37427 | 🇲🇽 MX | Pressure Switch | View on Amazon |
| UAC Fits: 1.8L L4 Turbocharged | SW11224C | 🇲🇽 MX | Pressure Transducer | View on Amazon |
| VNE Fits: 1.8L L4 Turbocharged | 4016002 | 🇲🇽 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.
3 A/C Refrigerant Pressure Switch parts are listed for the 2018 Audi A6, from FOUR SEASONS, UAC and VNE.
Part numbers include FOUR SEASONS 37427, UAC SW11224C and VNE 4016002.
Accessory Power Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: 1.8L L4 Turbocharged | 933332451 | 🇲🇽 MX | 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.
This group shows a single part: HELLA 933332451.
Brake Light Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 1.8L L4 Turbocharged | 920497 | 🇲🇽 MX | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ROSTRA Fits: 1.8L L4 Turbocharged | 620127 | 🇲🇽 MX | View on Amazon | |
| STANDARD MOTOR PRODUCTS Fits: 1.8L L4 Turbocharged | SLS488 | 🇲🇽 MX | View on Amazon | |
| WELLS Fits: 1.8L L4 Turbocharged | 1S10938 | 🇲🇽 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 are listed for the 2018 Audi A6, from DORMAN, ROSTRA, STANDARD MOTOR PRODUCTS and 1 other brand.
In the Economy grade, DORMAN supplies 1 part: the catalog's value-priced group. A representative part number is DORMAN 920497.
The Standard Replacement section lists 3 options from ROSTRA, STANDARD MOTOR PRODUCTS and WELLS — built to original-equipment specification. ROSTRA 620127 is listed in this group.
This group includes DORMAN 920497, ROSTRA 620127 and STANDARD MOTOR PRODUCTS SLS488 and the remaining parts above.
Dimmer Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: 1.8L L4 Turbocharged | 1S14794 | 🇲🇽 MX | with Lane Departure Warning Systemwithout Lane Change Assist | View on Amazon |
| WELLS Fits: 1.8L L4 Turbocharged | 1S14788 | 🇲🇽 MX | without Lane Departure Warning Systemwithout Lane Change Assist | View on Amazon |
This table covers the dimmer switches that select headlamp high and low beam. 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 Dimmer Switch parts for the 2018 Audi A6 come from WELLS.
This group includes WELLS 1S14794 and WELLS 1S14788.
Fog / Driving Lamp Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: 1.8L L4 Turbocharged | 933332451 | 🇲🇽 MX | 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.
One part is listed for the 2018 Audi A6 — HELLA 933332451.
Fuel Pump / Circuit Opening Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: 1.8L L4 Turbocharged | 933332451 | 🇲🇽 MX | 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.
One part is listed for the 2018 Audi A6 — HELLA 933332451.
Horn Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: 1.8L L4 Turbocharged | 1R2303 | 🇲🇽 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.
Ignition Starter Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: 1.8L L4 Turbocharged | 1S17872 | 🇲🇽 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.
This group shows a single part: WELLS 1S17872.
Multi-Function Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BOSCH Fits: 1.8L L4 Turbocharged | 0986332209 | 🇲🇽 MX | Multi-Purpose Relay | View on Amazon |
| BOSCH Fits: 1.8L L4 Turbocharged | 0986AH0080 | 🇲🇽 MX | Multi-Purpose Relay | View on Amazon |
| ÜRO PARTS Fits: 1.8L L4 Turbocharged | 7M0951253A | 🇲🇽 MX | View on Amazon | |
| WELLS Fits: 1.8L L4 Turbocharged | 1R1007 | 🇲🇽 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 are listed for the 2018 Audi A6, from BOSCH, ÜRO PARTS and WELLS.
Listed part numbers: BOSCH 0986332209, BOSCH 0986AH0080 and ÜRO PARTS 7M0951253A, plus the other parts above.
Oil Pressure Sender / Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY Popular Fits: 1.8L L4 Turbocharged | 2011983 | 🇲🇽 MX | with Light2.15-2.95 BAR | View on Amazon |
| HOLSTEIN Fits: 1.8L L4 Turbocharged | 2OPS0303 | 🇲🇽 MX | Dark Blue1 Blade Terminal | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 1.8L L4 Turbocharged | PS489 | 🇲🇽 MX | Terminal Quantity: 2 | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 1.8L L4 Turbocharged | PS665 | 🇲🇽 MX | BlackColor: Green | View on Amazon |
| VEMO Fits: 1.8L L4 Turbocharged | V10720420 | 🇲🇽 MX | From 08/28/2017 | 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 are listed for the 2018 Audi A6, from STANDARD MOTOR PRODUCTS, BECK/ARNLEY, HOLSTEIN and 1 other brand. BECK/ARNLEY 2011983 carries the "Popular" badge.
Part numbers include BECK/ARNLEY 2011983, HOLSTEIN 2OPS0303 and STANDARD MOTOR PRODUCTS PS489, among others listed above.
Power Window Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 1.8L L4 Turbocharged | DWS2198 | 🇲🇽 MX | Right | View on Amazon |
| WELLS Fits: 1.8L L4 Turbocharged | 1S13089 | 🇲🇽 MX | Fits Rear | View on Amazon |
| WELLS Fits: 1.8L L4 Turbocharged | 1S13072 | 🇲🇽 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.
3 Power Window Switch parts are listed for the 2018 Audi A6, from WELLS and STANDARD MOTOR PRODUCTS.
This group includes STANDARD MOTOR PRODUCTS DWS2198, WELLS 1S13089 and WELLS 1S13072.
Radiator Fan Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: 1.8L L4 Turbocharged | 933332451 | 🇲🇽 MX | 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.
This group shows a single part: HELLA 933332451.
Turn Signal Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: 1.8L L4 Turbocharged | 1S14794 | 🇲🇽 MX | with Lane Departure Warning Systemwithout Lane Change Assist | View on Amazon |
| WELLS Fits: 1.8L L4 Turbocharged | 1S14788 | 🇲🇽 MX | without Lane Departure Warning Systemwithout Lane Change Assist | 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.
WELLS supplies both parts for the 2018 Audi A6.
This group includes WELLS 1S14794 and WELLS 1S14788.
Wiper / Washer Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: 1.8L L4 Turbocharged | 1S14794 | 🇲🇽 MX | with Lane Departure Warning Systemwithout Lane Change Assist | View on Amazon |
| WELLS Fits: 1.8L L4 Turbocharged | 1S14788 | 🇲🇽 MX | without Lane Departure Warning Systemwithout Lane Change Assist | View on Amazon |
This table covers the Wiper / Washer 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.
2 Wiper / Washer Switch parts for the 2018 Audi A6 come from WELLS.
Part numbers include WELLS 1S14794 and WELLS 1S14788.
Buying Electrical Switch & Relay Parts for a 2018 Audi A6
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 Brake Light Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2018 Audi A6?
Our catalog currently lists 32 electrical switch & relay parts for the 2018 Audi A6 across 15 subcategories and 13 brands, covering all 3 engine options (1.8L L4 Turbocharged, 2.0L L4 Turbocharged and 3.0L V6 Supercharged). Each part is matched to the engine(s) it fits.
Do electrical switch & relay parts differ between 2018 Audi A6 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 2018 Audi A6?
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 A6 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 A6?
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 A6
Electrical Switch & Relay Parts for Other Audi A6 Years
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