The 2021 BMW X3 has 30 belt drive parts with verified fitment on this page — 3 part types and 10 brands, covering all 3 engine options (2.0L L4 ELECTRIC/GAS Turbocharged, 2.0L L4 Turbocharged and 3.0L L6 Turbocharged). Each part includes a manufacturer part number and application notes.
On the 2021 BMW X3, the belt drive system spins the accessories — serpentine and V-belts, tensioners, idlers and pulleys. All 30 listed parts are Belt (21 parts), Belt Tensioner (5 parts) and Idler Pulley (4 parts).
The 2021 BMW X3 was sold with 3 engines. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
10 brands supply belt drive parts for the 2021 BMW X3, led by CONTINENTAL (9 parts), DAYCO (6 parts) and GATES (4 parts), plus 7 more brands. Quality grades include Economy and Standard Replacement.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2021 BMW X3. 6 parts have it, including CONTINENTAL 465K6MK (Belt) and DAYCO 5040382DR (Belt). Each part number opens a page with every vehicle that part fits.
Belt
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CONTINENTAL Popular Fits: 3.0L L6 Turbocharged | 465K6MK | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Mileage MakerSerpentine | View on Amazon |
| DAYCO Popular Fits: 2.0L L4 ELECTRIC/GAS Turbocharged | 5040382DR | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Drive Rite®Serpentine | View on Amazon |
| GATES Popular Fits: 2.0L L4 Turbocharged | K060455 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Micro-V | View on Amazon |
| CONTINENTAL Fits: 2.0L L4 ELECTRIC/GAS Turbocharged | 382K4MK | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Mileage MakerSerpentine | View on Amazon |
| CONTINENTAL Fits: 2.0L L4 Turbocharged, 3.0L L6 Turbocharged | 455K6MK | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Mileage MakerMulti V-Belt | View on Amazon |
| DAYCO Fits: 3.0L L6 Turbocharged | 5060465DR | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Drive Rite®Serpentine | View on Amazon |
| FVP Fits: 2.0L L4 ELECTRIC/GAS Turbocharged | 382K4 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi V-BeltSerpentine | View on Amazon |
| FVP Fits: 2.0L L4 Turbocharged, 3.0L L6 Turbocharged | 455K6 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi V-BeltSerpentine | View on Amazon |
| FVP Fits: 3.0L L6 Turbocharged | 465K6 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi V-BeltSerpentine | View on Amazon |
| ROADMAX Fits: 2.0L L4 Turbocharged | 6K455AP | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | V-RibbedSerpentine | View on Amazon |
| ULTRA-POWER Fits: 2.0L L4 Turbocharged, 3.0L L6 Turbocharged | 455K6 | 🇺🇸 US 🇨🇦 CA | Multi-V | View on Amazon |
| ULTRA-POWER Fits: 2.0L L4 Turbocharged | K060455 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CONTINENTAL Popular Fits: 2.0L L4 Turbocharged, 3.0L L6 Turbocharged | 4060455 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi V-BeltSerpentine | View on Amazon |
| CONTINENTAL Popular Fits: 3.0L L6 Turbocharged | 4060465 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi V-BeltSerpentine | View on Amazon |
| DAYCO Popular Fits: 2.0L L4 ELECTRIC/GAS Turbocharged | 5040382 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Serpentine | View on Amazon |
| ACDELCO Fits: 2.0L L4 Turbocharged | 6K455 | 🇺🇸 US 🇨🇦 CA | Professional / GoldSerpentine | View on Amazon |
| CONTINENTAL Fits: 2.0L L4 ELECTRIC/GAS Turbocharged | 4040382 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi V-BeltSerpentine | View on Amazon |
| DAYCO Fits: 2.0L L4 Turbocharged, 3.0L L6 Turbocharged | 5060455 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Serpentine | View on Amazon |
| DAYCO Fits: 3.0L L6 Turbocharged | 5060465 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Serpentine | View on Amazon |
| GATES Fits: 2.0L L4 ELECTRIC/GAS Turbocharged | K030380 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Micro-V | View on Amazon |
| GATES Fits: 3.0L L6 Turbocharged | K060470EST | 🇺🇸 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 for the 2021 BMW X3 come from 7 brands — CONTINENTAL, DAYCO, GATES and 4 other brands. The "Popular" part is CONTINENTAL 465K6MK.
The Economy section lists 12 options from CONTINENTAL, FVP, DAYCO and 3 other brands — the catalog's value-priced group. CONTINENTAL 465K6MK is listed in this group.
In the Standard Replacement grade, CONTINENTAL, DAYCO, GATES and 1 other brand supply 9 parts: built to original-equipment specification. A representative part number is CONTINENTAL 4060455.
Belt Tensioner
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ULTRA-POWER Fits: 2.0L L4 Turbocharged | 39381 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CONTINENTAL Fits: 2.0L L4 Turbocharged | 49878 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi-V | View on Amazon |
| GATES Fits: 2.0L L4 Turbocharged | 39381 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| LITENS Fits: 2.0L L4 Turbocharged | 999682A | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CONTINENTAL Fits: 2.0L L4 ELECTRIC/GAS Turbocharged, 3.0L L6 Turbocharged | 49878 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi-V | 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.
5 Belt Tensioner parts are listed for the 2021 BMW X3, from CONTINENTAL, ULTRA-POWER, GATES and 1 other brand.
Economy: 1 part, from ULTRA-POWER. A representative part number is ULTRA-POWER 39381.
The Standard Replacement section: 3 options from CONTINENTAL, GATES and LITENS. CONTINENTAL 49878 is listed in this group.
1 ungrouped part is not assigned to a grade, with the same engine-level match.
This group includes ULTRA-POWER 39381 and CONTINENTAL 49878 and the remaining parts above.
Idler Pulley
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ÜRO PARTS Fits: 3.0L L6 Turbocharged | 11288673720 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | M Competition or M Model | View on Amazon |
| VAICO Fits: 3.0L L6 Turbocharged | V202769 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Material Type: Plastic | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CONTINENTAL Fits: 3.0L L6 Turbocharged | 50069 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | SmoothIncludes Hardware | View on Amazon |
| DAYCO Fits: 3.0L L6 Turbocharged | 89551 | 🇺🇸 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.
4 Idler Pulley parts for the 2021 BMW X3 come from 4 brands — ÜRO PARTS, VAICO, CONTINENTAL and 1 other brand.
The Economy section: 2 options from ÜRO PARTS and VAICO. ÜRO PARTS 11288673720 is listed in this group.
Standard Replacement: 2 parts, from CONTINENTAL and DAYCO. A representative part number is CONTINENTAL 50069.
Listed part numbers: ÜRO PARTS 11288673720, VAICO V202769 and CONTINENTAL 50069, plus the other parts above.
Buying Belt Drive Parts for a 2021 BMW X3
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 Belt Tensioner .
Frequently Asked Questions
How many belt drive parts fit the 2021 BMW X3?
Our catalog currently lists 30 belt drive parts for the 2021 BMW X3 across 3 subcategories and 10 brands, covering all 3 engine options (2.0L L4 ELECTRIC/GAS Turbocharged, 2.0L L4 Turbocharged and 3.0L L6 Turbocharged). Each part is matched to the engine(s) it fits.
Do belt drive parts differ between 2021 BMW X3 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 BMW X3?
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 BMW X3 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 BMW X3?
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 BMW X3
Belt Drive Parts for Other BMW X3 Years
Switch vehicle or jump to a subcategory
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.