This page lists 27 belt drive parts for the 2021 Mazda CX-5, across 4 part types, covering both the 2.5L L4 and the 2.5L L4 Turbocharged. Every part shows its brand, manufacturer part number and fitment notes.
On the 2021 Mazda CX-5, the belt drive system spins the accessories — serpentine and V-belts, tensioners, idlers and pulleys. Most of the listed parts are Belt (16 parts), Belt Tensioner (8 parts) and Belt Removal / Installation Tool (2 parts). The other 1 part type covers the remaining 1 part.
The 2021 Mazda CX-5 was sold with both the 2.5L L4 and the 2.5L L4 Turbocharged. 8 parts fit every engine; the other 19 are engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2021 Mazda CX-5 belt drive parts are GATES (7 parts), CONTINENTAL (6 parts) and ACDELCO (4 parts), plus 6 more brands. Quality grades include Standard Replacement, Economy and Kit.
7 parts on this 2021 Mazda CX-5 page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including BANDO 6PK965 (Belt) and GATES 90K39390 (Belt Tensioner). Click any part number to see every vehicle that part fits.
Belt
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CONTINENTAL Fits: 2.5L L4 | 382K6MK | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Mileage MakerSerpentine | View on Amazon |
| FVP Fits: 2.5L L4 | 380K6 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi V-BeltSerpentine | View on Amazon |
| FVP Fits: 2.5L L4 Turbocharged | 315K3S | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi V-Belt Stretch BeltSerpentine | View on Amazon |
| GATES Fits: 2.5L L4 | K060380 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Micro-V | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BANDO Popular Fits: 2.5L L4 | 6PK965 | 🇲🇽 MX | Rib Quantity: 6Inch Number: 380K6 | View on Amazon |
| CONTINENTAL Popular Fits: 2.5L L4 Turbocharged | 4030315S | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi V-Belt Stretch Belt | View on Amazon |
| GATES Popular Fits: 2.5L L4 | K030315SF | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Premium OE Stretch Fit Micro-V BeltRequires Installation Tool | View on Amazon |
| GATES Popular Fits: 2.5L L4 Turbocharged | K030305SF | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Premium OE Stretch Fit Micro-V Belt | View on Amazon |
| ACDELCO Fits: 2.5L L4 | 3K315SF | 🇺🇸 US 🇨🇦 CA | Professional / GoldStretch Fit | View on Amazon |
| ACDELCO Fits: 2.5L L4 | 6K380 | 🇺🇸 US 🇨🇦 CA | Professional / GoldSerpentine | View on Amazon |
| CONTINENTAL Fits: 2.5L L4 | 4060382 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi V-BeltSerpentine | View on Amazon |
| CONTINENTAL Fits: 2.5L L4 Turbocharged | 315K3MKS | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Serpentine Stretch Belt | View on Amazon |
| CONTINENTAL Fits: 2.5L L4 Turbocharged | 6PK970 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Metric LineSerpentine | View on Amazon |
| DAYCO Fits: 2.5L L4 | 5060382 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Serpentine | View on Amazon |
| DAYCO Fits: 2.5L L4 | 3PK814EE | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | ELA® Stretch BeltSerpentine | View on Amazon |
| DAYCO Fits: 2.5L L4 Turbocharged | 3PK794EE | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | ELA® Stretch BeltSerpentine | 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.
16 Belt parts are listed for the 2021 Mazda CX-5, from CONTINENTAL, GATES, DAYCO and 3 other brands. BANDO 6PK965 carries the "Popular" badge.
In the Economy grade, FVP, CONTINENTAL and GATES supply 4 parts: the catalog's value-priced group. A representative part number is CONTINENTAL 382K6MK.
The Standard Replacement section lists 12 options from CONTINENTAL, DAYCO, GATES and 2 other brands — built to original-equipment specification. BANDO 6PK965 is listed in this group.
Belt Removal / Installation Tool
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Fits: all 2021 CX-5 engines | 91030 | 🇺🇸 US 🇨🇦 CA | Professional / GoldMicro-V Stretch Fit Installation Tool | View on Amazon |
| GATES Fits: all 2021 CX-5 engines | 91030 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Micro-V Stretch Fit Installation Tool | View on Amazon |
This table covers the Belt Removal / Installation tools. This is a service tool, not a wear part — match the application in the notes.
2 Belt Removal / Installation Tool parts for the 2021 Mazda CX-5 come from 2 brands — ACDELCO and GATES. Every part fits both the 2.5L L4 and the 2.5L L4 Turbocharged.
Listed part numbers: ACDELCO 91030, plus the other parts above.
Belt Tensioner
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CLOYES Fits: all 2021 CX-5 engines | B20102 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
Kit
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Popular Fits: 2.5L L4 | 90K39390 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | KitIncludes: 2 Belts, Tensioner | View on Amazon |
| GATES Fits: 2.5L L4 Turbocharged | 90K39390B | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | KitIncludes: 2 Belts, Tensioner | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CONTINENTAL Popular Fits: all 2021 CX-5 engines | 49858 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi-V | View on Amazon |
| LITENS Popular Fits: all 2021 CX-5 engines | 999630A | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| ACDELCO Fits: all 2021 CX-5 engines | 39390 | 🇺🇸 US 🇨🇦 CA | Professional / Gold | View on Amazon |
| DAYCO Fits: all 2021 CX-5 engines | 89710 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| GATES Fits: all 2021 CX-5 engines | 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.
8 Belt Tensioner parts for the 2021 Mazda CX-5 come from 6 brands — GATES, CLOYES, CONTINENTAL and 3 other brands. The "Popular" part is GATES 90K39390. 6 parts fit every engine; the other 2 are engine-specific.
The Economy section: 1 option from CLOYES. CLOYES B20102 is listed in this group.
The Kit section lists 2 options from GATES — grouped under the catalog's "Kit" designation — the notes column spells out what sets them apart. GATES 90K39390 is listed in this group.
Standard Replacement: 5 parts, from CONTINENTAL, LITENS, ACDELCO and 2 other brands. A representative part number is CONTINENTAL 49858.
This group includes GATES 90K39390, CLOYES B20102 and GATES 90K39390B and the remaining parts above.
Belt Tensioner Adjuster
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SKP Fits: 2.5L L4 | SK90K39390 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the Belt Tensioner adjusters.
This group shows a single part: SKP SK90K39390.
Buying Belt Drive Parts for a 2021 Mazda CX-5
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 Belt Tensioner .
Frequently Asked Questions
How many belt drive parts fit the 2021 Mazda CX-5?
Our catalog currently lists 27 belt drive parts for the 2021 Mazda CX-5 across 4 subcategories and 9 brands, covering both the 2.5L L4 and the 2.5L L4 Turbocharged. Each part is matched to the engine(s) it fits.
Do belt drive parts differ between 2021 Mazda CX-5 engines?
Some do. 8 parts fit every engine; the other 19 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 Mazda CX-5?
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 CX-5 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 CX-5?
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 Mazda CX-5
Belt Drive Parts for Other Mazda CX-5 Years
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