30 Electrical switch & relay parts are listed for the 2019 Audi A3, in 15 part types, covering both the 1.4L L4 Turbocharged and the 2.0L L4 Turbocharged. Each one has a brand, a manufacturer part number and notes that say where it fits.
The switch and relay system on the 2019 Audi A3 covers the switches, relays and flashers that route power to everything the driver touches. The largest groups are A/C Refrigerant Pressure Switch (3 parts), Accessory Power Relay (3 parts) and Fuel Pump / Circuit Opening Relay (3 parts). The other 12 part types cover the remaining 21 parts.
The 2019 Audi A3 was sold with both the 1.4L L4 Turbocharged and the 2.0L L4 Turbocharged. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
11 brands supply electrical switch & relay parts for the 2019 Audi A3, led by WELLS (8 parts), HELLA (5 parts) and STANDARD MOTOR PRODUCTS (5 parts), plus 8 more brands. Quality grades include Economy and Standard Replacement.
Each part number listed for the 2019 Audi A3 opens a page with every vehicle that part fits.
A/C Condenser Fan Motor Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: 1.4L 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 2019 Audi A3 — HELLA 933332451.
A/C Refrigerant Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FOUR SEASONS Fits: 1.4L L4 Turbocharged | 37427 | 🇲🇽 MX | Pressure Switch | View on Amazon |
| UAC Fits: 1.4L L4 Turbocharged | SW11224C | 🇲🇽 MX | Pressure Transducer | View on Amazon |
| VNE Fits: 1.4L 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 2019 Audi A3, from FOUR SEASONS, UAC and VNE.
Part numbers include FOUR SEASONS 37427, UAC SW11224C and VNE 4016002.
ABS Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 1.4L L4 Turbocharged | RY577 | 🇲🇽 MX | Functions: Fuel Pump Relay | View on Amazon |
| WELLS Fits: 1.4L L4 Turbocharged | 1R2303 | 🇲🇽 MX | Mounting Hardware Included: No | View on Amazon |
This table covers the relays that control the ABS 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 ABS Relay parts are listed for the 2019 Audi A3, from STANDARD MOTOR PRODUCTS and WELLS.
Part numbers include STANDARD MOTOR PRODUCTS RY577 and WELLS 1R2303.
Accessory Power Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: 1.4L L4 Turbocharged | 933332451 | 🇲🇽 MX | 4-pin connector | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 1.4L L4 Turbocharged | RY577 | 🇲🇽 MX | Functions: Fuel Pump Relay | View on Amazon |
| WELLS Fits: 1.4L L4 Turbocharged | 1R2303 | 🇲🇽 MX | Mounting Hardware Included: No | 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.
3 Accessory Power Relay parts for the 2019 Audi A3 come from 3 brands — HELLA, STANDARD MOTOR PRODUCTS and WELLS.
Part numbers include HELLA 933332451, STANDARD MOTOR PRODUCTS RY577 and WELLS 1R2303.
Brake Light Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ÜRO PARTS Fits: 1.4L L4 Turbocharged | 5G0698459 | 🇲🇽 MX | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: 1.4L L4 Turbocharged | 1S10862 | 🇲🇽 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.
2 Brake Light Switch parts are listed for the 2019 Audi A3, from ÜRO PARTS and WELLS.
In the Economy grade, ÜRO PARTS supplies 1 part: the catalog's value-priced group. A representative part number is ÜRO PARTS 5G0698459.
The Standard Replacement section lists 1 option from WELLS — built to original-equipment specification. WELLS 1S10862 is listed in this group.
Listed part numbers: ÜRO PARTS 5G0698459 and WELLS 1S10862.
Clutch Pedal Position / Starter Safety Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 1.4L L4 Turbocharged | 9010003 | 🇲🇽 MX | View on Amazon |
This table covers the Clutch Pedal Position / Starter Safety 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: DORMAN 9010003.
Fog / Driving Lamp Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: 1.4L 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 2019 Audi A3 — HELLA 933332451.
Fuel Pump / Circuit Opening Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: 1.4L L4 Turbocharged | 933332451 | 🇲🇽 MX | 4-pin connector | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 1.4L L4 Turbocharged | RY577 | 🇲🇽 MX | Functions: Fuel Pump Relay | View on Amazon |
| WELLS Fits: 1.4L L4 Turbocharged | 1R2303 | 🇲🇽 MX | Mounting Hardware Included: No | 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.
3 Fuel Pump / Circuit Opening Relay parts are listed for the 2019 Audi A3, from HELLA, STANDARD MOTOR PRODUCTS and WELLS.
This group includes HELLA 933332451, STANDARD MOTOR PRODUCTS RY577 and WELLS 1R2303.
Horn Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: 1.4L 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 |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 1.4L L4 Turbocharged | US1419 | 🇲🇽 MX | View on Amazon | |
| WELLS Fits: 1.4L L4 Turbocharged | 1S17905 | 🇲🇽 MX | without keyless ignition system | 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 for the 2019 Audi A3 come from 2 brands — STANDARD MOTOR PRODUCTS and WELLS.
This group includes STANDARD MOTOR PRODUCTS US1419 and WELLS 1S17905.
Multi-Function Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BOSCH Fits: 1.4L L4 Turbocharged | 0986AH0307 | 🇲🇽 MX | Multi-Purpose Relay | View on Amazon |
| ÜRO PARTS Fits: 1.4L L4 Turbocharged | 7M0951253A | 🇲🇽 MX | View on Amazon | |
| WELLS Fits: 1.4L 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.
3 Multi-Function Relay parts are listed for the 2019 Audi A3, from BOSCH, ÜRO PARTS and WELLS.
This group includes BOSCH 0986AH0307, ÜRO PARTS 7M0951253A and WELLS 1R1007.
Oil Pressure Sender / Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY Fits: 1.4L L4 Turbocharged | 2011754 | 🇲🇽 MX | with Light0.55-0.85 BAR | View on Amazon |
| BECK/ARNLEY Fits: 1.4L L4 Turbocharged | 2011983 | 🇲🇽 MX | with Light2.15-2.95 BAR | View on Amazon |
| HOLSTEIN Fits: 1.4L L4 Turbocharged | 2OPS0303 | 🇲🇽 MX | Dark Blue1 Blade Terminal | 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.
3 Oil Pressure Sender / Switch parts are listed for the 2019 Audi A3, from BECK/ARNLEY and HOLSTEIN.
Part numbers include BECK/ARNLEY 2011754, BECK/ARNLEY 2011983 and HOLSTEIN 2OPS0303.
Radiator Fan Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: 1.4L 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 |
|---|---|---|---|---|
| DORMAN Fits: 1.4L L4 Turbocharged | 9785411 | 🇲🇽 MX | Chrome | View on Amazon |
| DORMAN Fits: 1.4L L4 Turbocharged | 9785412 | 🇲🇽 MX | Chrome | 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.
DORMAN supplies both parts for the 2019 Audi A3.
Listed part numbers: DORMAN 9785411 and DORMAN 9785412.
Washer Pump Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 1.4L L4 Turbocharged | RY577 | 🇲🇽 MX | Functions: Fuel Pump Relay | View on Amazon |
| WELLS Fits: 1.4L L4 Turbocharged | 1R2303 | 🇲🇽 MX | Mounting Hardware Included: No | View on Amazon |
This table covers the relays that control the Washer Pump 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 Washer Pump Relay parts are listed for the 2019 Audi A3, from STANDARD MOTOR PRODUCTS and WELLS.
Part numbers include STANDARD MOTOR PRODUCTS RY577 and WELLS 1R2303.
Buying Electrical Switch & Relay Parts for a 2019 Audi A3
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: A/C Refrigerant Pressure Switch and Accessory Power Relay .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2019 Audi A3?
Our catalog currently lists 30 electrical switch & relay parts for the 2019 Audi A3 across 15 subcategories and 11 brands, covering both the 1.4L L4 Turbocharged and the 2.0L L4 Turbocharged. Each part is matched to the engine(s) it fits.
Do electrical switch & relay parts differ between 2019 Audi A3 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 2019 Audi A3?
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 2019 Audi A3 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 2019 Audi A3?
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 2019 Audi A3
Electrical Switch & Relay Parts for Other Audi A3 Years
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