The 2021 Audi A6 has 31 belt drive parts with verified fitment on this page — 3 part types and 9 brands, covering both the 2.0L L4 Turbocharged and the 3.0L V6 Turbocharged. Each part includes a manufacturer part number and application notes.
On the 2021 Audi A6, the belt drive system spins the accessories — serpentine and V-belts, tensioners, idlers and pulleys. All 31 listed parts are Belt (21 parts), Idler Pulley (6 parts) and Belt Tensioner (4 parts).
The 2021 Audi A6 was sold with both the 2.0L L4 Turbocharged and the 3.0L V6 Turbocharged. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2021 Audi A6 belt drive parts are CONTINENTAL (12 parts), GATES (5 parts) and DAYCO (4 parts), plus 6 more brands. Quality grades include Standard Replacement, Economy and Kit.
7 parts on this 2021 Audi A6 page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including CONTINENTAL 440K4MK (Belt) and LITENS 900699A (Idler Pulley). Click any part number to see every vehicle that part fits.
Belt
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CONTINENTAL Popular Fits: 3.0L V6 Turbocharged | 440K4MK | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Mileage MakerSerpentine | View on Amazon |
| GATES Popular Fits: 3.0L V6 Turbocharged | K040440 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Micro-V | View on Amazon |
| CONTINENTAL Fits: 2.0L L4 Turbocharged | 445K6MK | 🇲🇽 MX | Mileage MakerSerpentine | View on Amazon |
| CONTINENTAL Fits: 2.0L L4 Turbocharged | 450K6MK | 🇺🇸 US 🇨🇦 CA | Mileage MakerSerpentine | View on Amazon |
| DAYCO Fits: 2.0L L4 Turbocharged | 5060450DR | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Drive Rite®Serpentine | View on Amazon |
| DAYCO Fits: 3.0L V6 Turbocharged | 5040440DR | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Drive Rite®Serpentine | View on Amazon |
| FVP Fits: 2.0L L4 Turbocharged | 450K6 | 🇺🇸 US 🇨🇦 CA | Multi V-BeltSerpentine | View on Amazon |
| FVP Fits: 2.0L L4 Turbocharged | 445K6 | 🇲🇽 MX | Multi V-BeltSerpentine | View on Amazon |
| FVP Fits: 3.0L V6 Turbocharged | 440K4 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi V-BeltSerpentine | View on Amazon |
| ROADMAX Fits: 3.0L V6 Turbocharged | 4K440AP | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | V-RibbedSerpentine | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CONTINENTAL Popular Fits: 2.0L L4 Turbocharged | 4060450 | 🇺🇸 US 🇨🇦 CA | Multi V-BeltSerpentine | View on Amazon |
| CONTINENTAL Popular Fits: 3.0L V6 Turbocharged | 4040440 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi V-BeltSerpentine | View on Amazon |
| DAYCO Popular Fits: 2.0L L4 Turbocharged | 5060450 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Serpentine | View on Amazon |
| ACDELCO Fits: 3.0L V6 Turbocharged | 4K440 | 🇺🇸 US 🇨🇦 CA | Professional / GoldSerpentine | View on Amazon |
| BANDO Fits: 3.0L V6 Turbocharged | 4PK1120 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rib Quantity: 4 | View on Amazon |
| CONTINENTAL Fits: 2.0L L4 Turbocharged | 6PK1130 | 🇲🇽 MX | Metric LineSerpentine | View on Amazon |
| CONTINENTAL Fits: 2.0L L4 Turbocharged | 4060445 | 🇲🇽 MX | Multi V-BeltSerpentine | View on Amazon |
| CONTINENTAL Fits: 3.0L V6 Turbocharged | 4PK1120 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Metric LineSerpentine | View on Amazon |
| DAYCO Fits: 3.0L V6 Turbocharged | 5040440 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Serpentine | View on Amazon |
| GATES Fits: 2.0L L4 Turbocharged | K060448EST | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | E-Start Micro-V | View on Amazon |
| GATES Fits: 3.0L V6 Turbocharged | K060567EST | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | E-Start Micro-V | View on Amazon |
This table covers the serpentine and accessory belts that drive the front accessories. Typical signs include squeal on cold start, cracks across the ribs, or glazing on the back of the belt. A new belt on a worn tensioner will squeal within weeks — spin the idlers by hand while the belt is off.
21 Belt parts are listed for the 2021 Audi A6, from CONTINENTAL, DAYCO, GATES and 4 other brands. CONTINENTAL 440K4MK carries the "Popular" badge.
In the Economy grade, CONTINENTAL, FVP, DAYCO and 2 other brands supply 10 parts: the catalog's value-priced group. A representative part number is CONTINENTAL 440K4MK.
The Standard Replacement section lists 11 options from CONTINENTAL, DAYCO, GATES and 2 other brands — built to original-equipment specification. CONTINENTAL 4060450 is listed in this group.
Belt Tensioner
Kit
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CONTINENTAL Fits: 2.0L L4 Turbocharged | K49485 | 🇲🇽 MX | Kit | View on Amazon |
| LITENS Fits: 3.0L V6 Turbocharged | LV950699B | 🇺🇸 US | Kit | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CONTINENTAL Fits: 2.0L L4 Turbocharged | 49485 | 🇲🇽 MX | Multi-V | View on Amazon |
| GATES Fits: 3.0L V6 Turbocharged | 39527 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Air Conditioning and Alternator | View on Amazon |
This table covers the automatic tensioners that hold belt tension. Typical signs include belt flutter, a chirp that returns after a new belt, or a damper that no longer holds the arm. Replace the tensioner with the belt at higher mileage; the labor overlaps almost entirely.
4 Belt Tensioner parts for the 2021 Audi A6 come from 3 brands — CONTINENTAL, LITENS and GATES.
The Kit section lists 2 options from CONTINENTAL and LITENS — grouped under the catalog's "Kit" designation — the notes column spells out what sets them apart. CONTINENTAL K49485 is listed in this group.
Standard Replacement: 2 parts, from CONTINENTAL and GATES. A representative part number is CONTINENTAL 49485.
This group includes CONTINENTAL K49485, LITENS LV950699B and CONTINENTAL 49485 and the remaining parts above.
Idler Pulley
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VAICO Fits: 3.0L V6 Turbocharged | V108921 | 🇺🇸 US | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| LITENS Popular Fits: 3.0L V6 Turbocharged | 900699A | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Smooth | View on Amazon |
| LITENS Popular Fits: 3.0L V6 Turbocharged | 900700A | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Smooth | View on Amazon |
| CONTINENTAL Fits: 3.0L V6 Turbocharged | 50099 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Smooth | View on Amazon |
| CONTINENTAL Fits: 3.0L V6 Turbocharged | 50100 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Smooth | View on Amazon |
| GATES Fits: 3.0L V6 Turbocharged | 36901 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Smooth | View on Amazon |
This table covers the idler pulleys the belt wraps around. Typical signs include a chirp that follows engine speed, or a pulley that feels rough or has play. Replace a noisy idler with the belt — the labor is already paid for.
6 Idler Pulley parts are listed for the 2021 Audi A6, from LITENS, CONTINENTAL, VAICO and 1 other brand. LITENS 900699A carries the "Popular" badge.
Economy: 1 part, from VAICO. A representative part number is VAICO V108921.
The Standard Replacement section: 5 options from LITENS, CONTINENTAL and GATES. LITENS 900699A is listed in this group.
Part numbers include LITENS 900699A, VAICO V108921 and LITENS 900700A, among others listed above.
Buying Belt Drive Parts for a 2021 Audi A6
On this vehicle, the belt drive system spins the accessories — serpentine and V-belts, tensioners, idlers and pulleys.
- Match the engine first. Every belt drive 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 tensioner and idler pulleys with any belt at higher mileage — the labor overlaps almost entirely.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Belt and Idler Pulley .
Frequently Asked Questions
How many belt drive parts fit the 2021 Audi A6?
Our catalog currently lists 31 belt drive parts for the 2021 Audi A6 across 3 subcategories and 9 brands, covering both the 2.0L L4 Turbocharged and the 3.0L V6 Turbocharged. Each part is matched to the engine(s) it fits.
Do belt drive parts differ between 2021 Audi A6 engines?
Yes. Every belt drive 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 belt drive problems on a 2021 Audi A6?
Common symptoms include squealing on cold start, a belt that shows cracking or glazing, or an accessory that slows under load. 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 tensioner and idler pulleys with any belt at higher mileage — the labor overlaps almost entirely.
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 2021 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 2021 Audi A6?
First match the engine — each row shows which engine(s) the part fits. Then a new belt on a worn tensioner will squeal within weeks — check tensioner damping and idler bearings while the belt is off. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 Audi A6
Belt Drive Parts for Other Audi A6 Years
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