9 Drivetrain parts are listed for the 2018 Audi A3, in 6 part types, covering all 4 engine options (1.4L L4 ELECTRIC/GAS Turbocharged, 1.4L L4 Turbocharged, 1.8L L4 Turbocharged and 2.0L L4 Turbocharged). Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 2018 Audi A3, the drivetrain system moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware. Most of the listed parts are CV Joint (2 parts), CV Joint Boot (2 parts) and Differential Seal (2 parts). The other 3 part types cover the remaining 3 parts.
The 2018 Audi A3 was sold with 4 engines. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
5 brands supply drivetrain parts for the 2018 Audi A3, led by VAICO (2 parts), MARELLI (2 parts) and BECK/ARNLEY (2 parts), plus 2 more brands.
Each part number listed for the 2018 Audi A3 opens a page with every vehicle that part fits.
AWD Coupling Oil Filter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VAICO Fits: 1.4L L4 Turbocharged, 1.8L L4 Turbocharged | V106662 | 🇲🇽 MX | View on Amazon |
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.
One part is listed for the 2018 Audi A3 — VAICO V106662.
Axle Bolt
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 1.4L L4 Turbocharged, 1.8L L4 Turbocharged | 6150061 | 🇲🇽 MX | FrontNon-Ribbed Version | View on Amazon |
This table covers the Axle bolts.
One part is listed for the 2018 Audi A3 — DORMAN 6150061.
CV Joint
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MARELLI Fits: 1.4L L4 Turbocharged, 1.8L L4 Turbocharged | TDS0017 | 🇲🇽 MX | Front Right | View on Amazon |
| MARELLI Fits: 1.4L L4 Turbocharged, 1.8L L4 Turbocharged | TOJ0312 | 🇲🇽 MX | Front | View on Amazon |
This table covers the constant-velocity joints at each end of a drive axle.
MARELLI supplies both parts for the 2018 Audi A3.
Listed part numbers: MARELLI TDS0017 and MARELLI TOJ0312.
CV Joint Boot
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY Fits: 1.4L L4 Turbocharged, 1.8L L4 Turbocharged | 1033193 | 🇲🇽 MX | Front Inner | View on Amazon |
| BECK/ARNLEY Fits: 1.4L L4 Turbocharged, 1.8L L4 Turbocharged | 1033194 | 🇲🇽 MX | Front Left Outer | View on Amazon |
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.
BECK/ARNLEY supplies both parts for the 2018 Audi A3.
This group includes BECK/ARNLEY 1033193 and BECK/ARNLEY 1033194.
Differential Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING Fits: 1.4L L4 Turbocharged, 1.8L L4 Turbocharged | 454820 | 🇲🇽 MX | Inside Diameter: 60.0 mmOutside Diameter: 74.0 mm | View on Amazon |
| ELRING Fits: 1.4L L4 Turbocharged | 914240 | 🇲🇽 MX | Dust Cover: with dust LipHeight [MM]: 8 | View on Amazon |
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.
2 Differential Seal parts for the 2018 Audi A3 come from ELRING.
Part numbers include ELRING 454820 and ELRING 914240.
Drive Shaft Flex Joint
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VAICO Fits: 1.4L L4 Turbocharged, 1.8L L4 Turbocharged | V1018008 | 🇲🇽 MX | View on Amazon |
This table covers the flex joints in the driveshaft.
One part is listed for the 2018 Audi A3 — VAICO V1018008.
Buying Drivetrain Parts for a 2018 Audi A3
On this vehicle, the drivetrain system moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware.
- Match the engine first. Every drivetrain 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, replace the differential or transfer-case fluid with any axle or seal job while everything is already open.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: CV Joint and CV Joint Boot .
Frequently Asked Questions
How many drivetrain parts fit the 2018 Audi A3?
Our catalog currently lists 9 drivetrain parts for the 2018 Audi A3 across 6 subcategories and 5 brands, covering all 4 engine options (1.4L L4 ELECTRIC/GAS Turbocharged, 1.4L L4 Turbocharged, 1.8L L4 Turbocharged and 2.0L L4 Turbocharged). Each part is matched to the engine(s) it fits.
Do drivetrain parts differ between 2018 Audi A3 engines?
Yes. Every drivetrain 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 drivetrain problems on a 2018 Audi A3?
Common symptoms include clicking in tight turns, a clunk when shifting between drive and reverse, vibration that builds with speed, or gear oil on the inside of a wheel. 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, replace the differential or transfer-case fluid with any axle or seal job while everything is already open.
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 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 2018 Audi A3?
First match the engine — each row shows which engine(s) the part fits. Then a torn CV boot caught early is a cheap boot kit; caught late it is a whole axle — inspect before deciding which to buy. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2018 Audi A3
Drivetrain Parts for Other Audi A3 Years
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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.