2020 Audi A3 Electrical Parts

This table covers the alternators that charge the battery and run the electrical load. Typical signs include dim lights at idle, a battery lamp, or a growl from the charging pulley. Load-test the battery and inspect the belt and grounds — a bad ground mimics a failed alternator. Read more

15 Alternator / Generator parts are listed for the 2020 Audi A3, from PURE ENERGY, TERREPOWER, WAI GLOBAL and 5 other brands. TYC 221081 carries the "Popular" badge.

In the New grade, WAI GLOBAL, VALEO and TYC supply 5 parts: brand-new units rather than rebuilt ones. A representative part number is TYC 221081.

In the Remanufactured grade, PURE ENERGY, TERREPOWER, REMY and 2 other brands supply 10 parts: factory-rebuilt units with new wear components. A representative part number is FVP 10273.

This table covers the batteries listed by group size and specification. Typical signs include slow cranking, a battery lamp, or a no-start after the vehicle sat overnight. Confirm group size and terminal layout in the notes. Clean the posts and the ground before condemning the battery. Read more

20 Battery parts for the 2020 Audi A3 come from 8 brands — ACDELCO, DEKA, FVP and 5 other brands. The "Popular" part is ACDELCO 47AGM. 15 parts fit every engine; the other 5 are engine-specific.

In the AGM (Extended Life) grade, ACDELCO, DEKA, FVP and 4 other brands supply 18 parts: grouped under the catalog's "AGM (Extended Life)" designation — the notes column spells out what sets them apart. A representative part number is ACDELCO 47AGM.

In the Performance AGM (Extended Life + Increased Power) grade, FULLRIVER supplies 2 parts: grouped under the catalog's "Performance AGM (Extended Life + Increased Power)" designation — the notes column spells out what sets them apart. A representative part number is FULLRIVER FT61047.

This table covers the Battery Current sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors. Read more

2 Battery Current Sensor parts are listed for the 2020 Audi A3, from STANDARD MOTOR PRODUCTS and VEMO.

Part numbers include STANDARD MOTOR PRODUCTS BSC101 and VEMO V10170002.

This table covers the Cruise Control Distance sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors. Read more

This group shows a single part: VEMO V10720539.

This table covers the Lane Departure Camera modules. Typical signs include a cluster of unrelated faults, a no-communication code, or a module that will not sleep. Confirm power, ground and programming compatibility in the notes. Modules are rarely plug-and-play across years. Read more

One part is listed for the 2020 Audi A3 — VEMO V10670037.

This table covers the modules that control the exterior lighting. Read more

6 Lighting Control Module (LCM) parts are listed for the 2020 Audi A3, from ÜRO PARTS and VEMO. ÜRO PARTS 8V0998473A carries the "Popular" badge. 5 parts fit every engine; the other 1 is engine-specific.

Part numbers include ÜRO PARTS 8V0998473A, ÜRO PARTS 8V0998473 and ÜRO PARTS 8V0998474, among others listed above.

This table covers the ultrasonic park-aid sensors in the bumper. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors. Read more

8 Parking Aid Sensor parts are listed for the 2020 Audi A3, from STANDARD MOTOR PRODUCTS, VARIOUS MFR and HELLA. STANDARD MOTOR PRODUCTS PPS120 carries the "Popular" badge. 6 parts fit every engine; the other 2 are engine-specific.

Listed part numbers: STANDARD MOTOR PRODUCTS PPS120, STANDARD MOTOR PRODUCTS PPS112 and HELLA 358141711, plus the other parts above.

This table covers the Rain sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors. Read more

VEMO supplies both parts for the 2020 Audi A3. All of them fit every engine offered in the 2020 A3.

Listed part numbers: VEMO V10721602 and VEMO V10721604.

This table covers the starter motors that crank the engine. Typical signs include no motion, a squeal, or a motor that only runs on one speed. Confirm power, ground and the control module before replacing the motor. Read more

9 Starter Motor parts are listed for the 2020 Audi A3, from HELLA, BOSCH, WAI GLOBAL and 5 other brands. BOSCH SR6601N carries the "Popular" badge.

New: 3 parts, from BOSCH, WAI GLOBAL and VALEO. A representative part number is BOSCH SR6601N.

Remanufactured: 4 parts, from FVP, PURE ENERGY, REMY and 1 other brand. A representative part number is FVP 12791.

2 ungrouped parts are not assigned to a grade, with the same engine-level match.

This group includes BOSCH SR6601N, WAI GLOBAL 30236N and VALEO 438339 and the remaining parts above.