The 2021 Mazda 6 has 16 belt drive parts with verified fitment on this page — 2 part types and 8 brands, covering the 2.5L L4 Turbocharged engine. Each part includes a manufacturer part number and application notes.
On the 2021 Mazda 6, the belt drive system spins the accessories — serpentine and V-belts, tensioners, idlers and pulleys. All 16 listed parts are Belt (9 parts) and Belt Tensioner (7 parts).
The 2021 Mazda 6 came with a single engine, the 2.5L L4 Turbocharged, and every part is verified against it.
8 brands supply belt drive parts for the 2021 Mazda 6, led by GATES (4 parts), CONTINENTAL (3 parts) and DAYCO (3 parts), plus 5 more brands. Quality grades include Standard Replacement, Economy and Kit.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2021 Mazda 6. 4 parts have it, including BANDO 6PK965 (Belt) and CONTINENTAL 49858 (Belt Tensioner). Each part number opens a page with every vehicle that part fits.
Belt
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CONTINENTAL | 382K6MK | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Mileage MakerSerpentine | View on Amazon |
| FVP | 380K6 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi V-BeltSerpentine | View on Amazon |
| GATES | K060380 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Micro-V | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BANDO Popular | 6PK965 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rib Quantity: 6Inch Number: 380K6 | View on Amazon |
| CONTINENTAL Popular | 4060382 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi V-BeltSerpentine | View on Amazon |
| ACDELCO | 6K380 | 🇺🇸 US 🇨🇦 CA | Professional / GoldSerpentine | View on Amazon |
| DAYCO | 3PK794EE | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | ELA® Stretch BeltSerpentine | View on Amazon |
| DAYCO | 5060382 | 🇺🇸 US 🇨🇦 CA | Serpentine | View on Amazon |
| GATES | K030305SF | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Premium OE Stretch Fit Micro-V Belt | 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.
9 Belt parts for the 2021 Mazda 6 come from 6 brands — CONTINENTAL, GATES, DAYCO and 3 other brands. The "Popular" part is BANDO 6PK965.
The Economy section lists 3 options from CONTINENTAL, FVP and GATES — the catalog's value-priced group. CONTINENTAL 382K6MK is listed in this group.
In the Standard Replacement grade, DAYCO, BANDO, CONTINENTAL and 2 other brands supply 6 parts: built to original-equipment specification. A representative part number is BANDO 6PK965.
Part numbers include BANDO 6PK965, CONTINENTAL 382K6MK and FVP 380K6, among others listed above.
Belt Tensioner
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CLOYES | B20102 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
Kit
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES | 90K39390B | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | KitIncludes: 2 Belts, Tensioner | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CONTINENTAL Popular | 49858 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi-V | View on Amazon |
| LITENS Popular | 999630A | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| ACDELCO | 39390 | 🇺🇸 US 🇨🇦 CA | Professional / Gold | View on Amazon |
| DAYCO | 89710 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| GATES | 39390 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 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.
7 Belt Tensioner parts are listed for the 2021 Mazda 6, from GATES, CLOYES, CONTINENTAL and 3 other brands. CONTINENTAL 49858 carries the "Popular" badge.
Economy: 1 part, from CLOYES. A representative part number is CLOYES B20102.
In the Kit grade, GATES supplies 1 part: grouped under the catalog's "Kit" designation — the notes column spells out what sets them apart. A representative part number is GATES 90K39390B.
The Standard Replacement section: 5 options from CONTINENTAL, LITENS, ACDELCO and 2 other brands. CONTINENTAL 49858 is listed in this group.
Listed part numbers: CONTINENTAL 49858, CLOYES B20102 and GATES 90K39390B, plus the other parts above.
Buying Belt Drive Parts for a 2021 Mazda 6
On this vehicle, the belt drive system spins the accessories — serpentine and V-belts, tensioners, idlers and pulleys.
- Confirm you have the 2.5L L4 Turbocharged engine — every part on this page is matched to it.
- 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 Belt Tensioner .
Frequently Asked Questions
How many belt drive parts fit the 2021 Mazda 6?
Our catalog currently lists 16 belt drive parts for the 2021 Mazda 6 across 2 subcategories and 8 brands, covering the 2.5L L4 Turbocharged engine. Each part is matched to the engine(s) it fits.
What are the signs of belt drive problems on a 2021 Mazda 6?
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 Mazda 6 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 Mazda 6?
Every part on this page is matched to the 2.5L L4 Turbocharged engine. 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 Mazda 6
Belt Drive Parts for Other Mazda 6 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.