This page lists 28 belt drive parts for the 2021 Audi A8, across 3 part types, covering all 3 engine options (3.0L V6 ELECTRIC/GAS Turbocharged, 3.0L V6 Turbocharged and 4.0L V8 Turbocharged). Every part shows its brand, manufacturer part number and fitment notes.
The belt drive system on the 2021 Audi A8 spins the accessories — serpentine and V-belts, tensioners, idlers and pulleys. All 28 listed parts are Belt (19 parts), Idler Pulley (6 parts) and Belt Tensioner (3 parts).
The 2021 Audi A8 was sold with 3 engines. 3 parts fit every engine; the other 25 are engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2021 Audi A8 belt drive parts are CONTINENTAL (7 parts), GATES (6 parts) and DAYCO (5 parts), plus 6 more brands. Quality grades include Standard Replacement, Economy and Kit.
7 parts on this 2021 Audi A8 page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including CONTINENTAL 440K4MK (Belt) and LITENS 900700A (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 ELECTRIC/GAS Turbocharged, 3.0L V6 Turbocharged | 440K4MK | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Mileage MakerSerpentine | View on Amazon |
| GATES Popular Fits: 3.0L V6 Turbocharged, 3.0L V6 ELECTRIC/GAS Turbocharged | K040440 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Micro-V | View on Amazon |
| CONTINENTAL Fits: 4.0L V8 Turbocharged | 430K4MK | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Mileage MakerSerpentine | View on Amazon |
| DAYCO Fits: 3.0L V6 ELECTRIC/GAS Turbocharged, 3.0L V6 Turbocharged | 5040440DR | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Drive Rite®Serpentine | View on Amazon |
| DAYCO Fits: 4.0L V8 Turbocharged | 5040430DR | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Drive Rite®Serpentine | View on Amazon |
| FVP Fits: 3.0L V6 ELECTRIC/GAS Turbocharged, 3.0L V6 Turbocharged | 440K4 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi V-BeltSerpentine | View on Amazon |
| FVP Fits: 4.0L V8 Turbocharged | 430K4 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi V-BeltSerpentine | View on Amazon |
| ROADMAX Fits: 3.0L V6 ELECTRIC/GAS Turbocharged, 3.0L V6 Turbocharged | 4K440AP | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | V-RibbedSerpentine | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CONTINENTAL Popular Fits: 3.0L V6 ELECTRIC/GAS Turbocharged, 3.0L V6 Turbocharged | 4040440 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi V-BeltSerpentine | View on Amazon |
| DAYCO Popular Fits: 4.0L V8 Turbocharged | 5040430 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | SerpentineTop Width: .54 In | View on Amazon |
| DAYCO Popular Fits: 4.0L V8 Turbocharged | 5060353 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | SerpentineTop Width: .82 In | View on Amazon |
| ACDELCO Fits: 3.0L V6 ELECTRIC/GAS Turbocharged, 3.0L V6 Turbocharged | 4K440 | 🇺🇸 US 🇨🇦 CA | Professional / GoldSerpentine | View on Amazon |
| ACDELCO Fits: 4.0L V8 Turbocharged | 4K423 | 🇺🇸 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: 3.0L V6 ELECTRIC/GAS Turbocharged, 3.0L V6 Turbocharged | 4PK1120 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Metric LineSerpentine | View on Amazon |
| CONTINENTAL Fits: 4.0L V8 Turbocharged | 4040430 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi V-BeltSerpentine | View on Amazon |
| DAYCO Fits: 3.0L V6 ELECTRIC/GAS Turbocharged, 3.0L V6 Turbocharged | 5040440 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Serpentine | View on Amazon |
| GATES Fits: 3.0L V6 ELECTRIC/GAS Turbocharged, 3.0L V6 Turbocharged | K060567EST | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | E-Start Micro-V | View on Amazon |
| GATES Fits: 4.0L V8 Turbocharged | K040423 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 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.
19 Belt parts are listed for the 2021 Audi A8, from CONTINENTAL, DAYCO, GATES and 4 other brands. CONTINENTAL 440K4MK carries the "Popular" badge.
In the Economy grade, CONTINENTAL, DAYCO, FVP and 2 other brands supply 8 parts: the catalog's value-priced group. A representative part number is CONTINENTAL 440K4MK.
The Standard Replacement section lists 11 options from CONTINENTAL, DAYCO, ACDELCO and 2 other brands — built to original-equipment specification. CONTINENTAL 4040440 is listed in this group.
Belt Tensioner
Kit
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| LITENS Fits: 3.0L V6 Turbocharged | LV950699B | 🇺🇸 US 🇨🇦 CA | Kit | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Fits: 3.0L V6 Turbocharged | 39527 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Alternator | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Fits: 3.0L V6 ELECTRIC/GAS Turbocharged | 39527 | 🇺🇸 US 🇨🇦 CA | 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.
3 Belt Tensioner parts for the 2021 Audi A8 come from 2 brands — GATES and LITENS.
The Kit section lists 1 option from LITENS — grouped under the catalog's "Kit" designation — the notes column spells out what sets them apart. LITENS LV950699B is listed in this group.
Standard Replacement: 1 part, from GATES. A representative part number is GATES 39527.
1 further part sits outside the graded sections, with the same engine-level match.
This group includes LITENS LV950699B and GATES 39527 and the remaining parts above.
Idler Pulley
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VAICO Fits: all 2021 A8 engines | V108921 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| LITENS Popular Fits: 3.0L V6 ELECTRIC/GAS Turbocharged, 3.0L V6 Turbocharged | 900700A | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Smooth | View on Amazon |
| LITENS Popular Fits: 3.0L V6 Turbocharged, 4.0L V8 Turbocharged | 900699A | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Smooth | View on Amazon |
| CONTINENTAL Fits: all 2021 A8 engines | 50099 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Smooth | View on Amazon |
| CONTINENTAL Fits: 3.0L V6 ELECTRIC/GAS Turbocharged, 3.0L V6 Turbocharged | 50100 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Smooth | View on Amazon |
| GATES Fits: all 2021 A8 engines | 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 A8, from LITENS, CONTINENTAL, VAICO and 1 other brand. LITENS 900700A carries the "Popular" badge. 3 parts fit every engine; the other 3 are engine-specific.
Economy: 1 part, from VAICO. A representative part number is VAICO V108921.
The Standard Replacement section: 5 options from LITENS, CONTINENTAL and GATES. LITENS 900700A is listed in this group.
Part numbers include LITENS 900700A, VAICO V108921 and LITENS 900699A, among others listed above.
Buying Belt Drive Parts for a 2021 Audi A8
On this vehicle, the belt drive system spins the accessories — serpentine and V-belts, tensioners, idlers and pulleys.
- Match the engine first. Some belt drive parts fit every engine; others are 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 A8?
Our catalog currently lists 28 belt drive parts for the 2021 Audi A8 across 3 subcategories and 9 brands, covering all 3 engine options (3.0L V6 ELECTRIC/GAS Turbocharged, 3.0L V6 Turbocharged and 4.0L V8 Turbocharged). Each part is matched to the engine(s) it fits.
Do belt drive parts differ between 2021 Audi A8 engines?
Some do. 3 parts fit every engine; the other 25 are engine-specific. Each row (and the filter at the top) shows which. 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 A8?
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 A8 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 A8?
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 A8
Belt Drive Parts for Other Audi A8 Years
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