2020 Audi A3 Drivetrain Parts

This table covers the actuators that engage four-wheel drive at the transfer case or axle. Typical signs include a door or range that will not move, or a click with no motion. Confirm the command signal before replacing the actuator — a failed module looks the same. Read more

One part is listed for the 2020 Audi A3 — VAICO V108958.

This table covers the AWD Coupling fluids. Typical signs include discolored fluid, a burnt smell, or a level that keeps dropping. Use only the specification in the notes — the tables group grades because they are not interchangeable. Read more

2 AWD Coupling Fluid parts for the 2020 Audi A3 come from 2 brands — REIN and VAICO.

This group includes REIN FLDF003 and VAICO V600450.

This table covers the AWD Coupling Oil filters. Typical signs include restricted flow — long cranking, weak airflow, or dirty fluid after a short interval. Seat the new filter so it cannot bypass, and use the grade the notes call for. Read more

This group shows a single part: VAICO V106662.

This table covers the AWD Coupling Oil pumps. Typical signs include noise from the pump, no pressure, or fluid that never arrives at the outlet. Prime or fill the pump as the notes require. A dry start is a common way to kill a new unit. Read more

7 AWD Coupling Oil Pump parts for the 2020 Audi A3 come from VAICO. The "Popular" part is VAICO V106603XXL.

Listed part numbers: VAICO V106603XXL, VAICO V106592 and VAICO V106603, plus the other parts above.

This table covers the complete CV axle shafts from differential (or hub) to wheel. Typical signs include a click in tight turns, grease flung around the wheel well, or a vibration that builds with speed. A torn boot caught early is a boot kit; caught late it is the whole axle. Torque the axle nut to the method in the notes. Read more

15 CV Axle parts for the 2020 Audi A3 come from 4 brands — GSP, TOP NOTCH, TRAKMOTIVE and 1 other brand. The "Popular" part is TOP NOTCH TN19037PR. 6 parts fit every engine; the other 9 are engine-specific.

The Economy section lists 1 option from FAMOUS BRAND — the catalog's value-priced group. FAMOUS BRAND 1700748631 is listed in this group.

In the Premium grade, TOP NOTCH and GSP supply 5 parts: a step above OE specification in materials, tolerances or warranty terms. A representative part number is TOP NOTCH TN19037PR.

In the Standard Replacement grade, GSP, TRAKMOTIVE and TOP NOTCH supply 9 parts: built to original-equipment specification. A representative part number is TOP NOTCH TN19037.

This table covers the constant-velocity joints at each end of a drive axle. Read more

6 CV Joint parts for the 2020 Audi A3 come from 3 brands — GKN, MARELLI and VAICO. The "Popular" part is GKN 305448. 2 parts fit every engine; the other 4 are engine-specific.

Part numbers include GKN 305448, GKN 305021 and GKN 306653, among others listed above.

This table covers the boots that keep grease in a CV joint. Typical signs include a split boot, grease flung around the joint, or a click once grit is inside. A boot caught early is a kit. Once the joint has clicked, the joint itself is usually worn. Read more

8 CV Joint Boot parts for the 2020 Audi A3 come from 3 brands — GKN, BECK/ARNLEY and REIN. The "Popular" part is GKN 304936. 2 parts fit every engine; the other 6 are engine-specific.

Listed part numbers: GKN 304936, REIN BKN0121 and BECK/ARNLEY 1033193, plus the other parts above.

This table covers the Differential mounts. Typical signs include a clunk on takeoff, a vibration at idle, or a separated rubber insert. Support the powertrain before unbolting a mount, and torque the fasteners in the notes. Read more

VNE supplies both parts for the 2020 Audi A3.

This group includes VNE 4009408 and VNE 4009409.

This table covers the seals at the Differential. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

6 Differential Seal parts are listed for the 2020 Audi A3, from ELRING and VAICO. 1 part fits every engine; the other 5 are engine-specific.

This group includes ELRING 454820, ELRING 914240 and ELRING 101630 and the remaining parts above.

This table covers the driveshafts that carry torque from the transmission or transfer case. Read more

5 Drive Shaft parts are listed for the 2020 Audi A3, from GSP, TOP NOTCH and VAICO. VAICO V107631 carries the "Popular" badge.

Listed part numbers: VAICO V107631, GSP PS900584 and GSP PS900585, plus the other parts above.

This table covers the flex joints in the driveshaft. Read more

This group shows a single part: VAICO V1018008.

This table covers the gear oils specified for the axle or transfer case. Typical signs include a low-oil lamp, knocking, or oil that has gone thin before the next interval. Match the viscosity and spec in the notes, not just the weight on the bottle. Read more

8 Gear Oil parts for the 2020 Audi A3 come from 2 brands — VALVOLINE and VAICO. The "Popular" part is VALVOLINE VV975.

Listed part numbers: VALVOLINE VV975, VALVOLINE 889785 and VAICO V600364, plus the other parts above.

This table covers the fluids specified for the transfer case. Typical signs include discolored fluid, a burnt smell, or a level that keeps dropping. Use only the specification in the notes — the tables group grades because they are not interchangeable. Read more

9 Transfer Case Fluid parts for the 2020 Audi A3 come from 2 brands — VALVOLINE and VAICO. The "Popular" part is VALVOLINE VV975.

This group includes VALVOLINE VV975, VALVOLINE 889785 and VAICO V10000270 and the remaining parts above.

This table covers the seals at the Transfer Case Input Shaft. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

One part is listed for the 2020 Audi A3 — ELRING 871070.

This table covers the seals at the Transfer Case Output Shaft. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

This group shows a single part: TIMKEN SL260505.