The 2021 Toyota 4RUNNER has 31 belt drive parts with verified fitment on this page — 3 part types and 15 brands, covering the 4.0L V6 engine. Each part includes a manufacturer part number and application notes.
The belt drive system on the 2021 Toyota 4RUNNER spins the accessories — serpentine and V-belts, tensioners, idlers and pulleys. All 31 listed parts are Idler Pulley (17 parts), Belt Tensioner (8 parts) and Belt (6 parts).
Every part on this page is matched to the 4.0L V6 — the only engine offered in the 2021 Toyota 4RUNNER.
The most listed brands for 2021 Toyota 4RUNNER belt drive parts are CONTINENTAL (4 parts), GATES (4 parts) and DAYCO (4 parts), plus 12 more brands. Quality grades include Standard Replacement, Economy and Kit.
8 parts on this 2021 Toyota 4RUNNER page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including CONTINENTAL 4070846 (Belt) and GATES 90K39258 (Belt Tensioner). Click any part number to see every vehicle that part fits.
Belt
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP | 846K7 | 🇺🇸 US 🇨🇦 CA | Multi V-BeltSerpentine | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CONTINENTAL Popular | 4070846 | 🇺🇸 US 🇨🇦 CA | Multi V-BeltSerpentine | View on Amazon |
| GATES Popular | K070846 | 🇺🇸 US 🇨🇦 CA | Micro-V | View on Amazon |
| ACDELCO | 7K846 | 🇺🇸 US 🇨🇦 CA | Professional / GoldSerpentine | View on Amazon |
| BANDO | 7PK2145 | 🇺🇸 US 🇨🇦 CA | Rib Quantity: 7Effective Length: 2145.0 mm | View on Amazon |
| DAYCO | 5070846 | 🇺🇸 US 🇨🇦 CA | Serpentine | 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.
6 Belt parts are listed for the 2021 Toyota 4RUNNER, from FVP, CONTINENTAL, GATES and 3 other brands. CONTINENTAL 4070846 carries the "Popular" badge.
In the Economy grade, FVP supplies 1 part: the catalog's value-priced group. A representative part number is FVP 846K7.
The Standard Replacement section lists 5 options from CONTINENTAL, GATES, ACDELCO and 2 other brands — built to original-equipment specification. CONTINENTAL 4070846 is listed in this group.
This group includes CONTINENTAL 4070846, FVP 846K7 and GATES K070846 and the remaining parts above.
Belt Tensioner
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CLOYES | B20043 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| SKP | SK89374 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| ULTRA-POWER | 39258 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Kit
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Popular | 90K39258 | 🇺🇸 US 🇨🇦 CA | KitIncludes: Belt, Tensioner, 3 Idlers | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Popular | 39258 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| CONTINENTAL | 49873 | 🇺🇸 US 🇨🇦 CA | Multi-V | View on Amazon |
| DAYCO | 89374 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| LITENS | 999487A | 🇺🇸 US 🇨🇦 CA | 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 Toyota 4RUNNER come from 7 brands — GATES, CLOYES, SKP and 4 other brands. The "Popular" part is GATES 90K39258.
The Economy section: 3 options from CLOYES, SKP and ULTRA-POWER. CLOYES B20043 is listed in this group.
The Kit section lists 1 option from GATES — grouped under the catalog's "Kit" designation — the notes column spells out what sets them apart. GATES 90K39258 is listed in this group.
Standard Replacement: 4 parts, from GATES, CONTINENTAL, DAYCO and 1 other brand. A representative part number is GATES 39258.
This group includes GATES 90K39258, CLOYES B20043 and SKP SK89374 and the remaining parts above.
Idler Pulley
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SKP Popular | SK89158 | 🇺🇸 US 🇨🇦 CA | Smooth | View on Amazon |
| SKP Popular | SK89169 | 🇺🇸 US 🇨🇦 CA | Smooth | View on Amazon |
| AUTOTECNICA | TY1421618 | 🇺🇸 US 🇨🇦 CA | Smooth | View on Amazon |
| DORMAN | 419651 | 🇺🇸 US 🇨🇦 CA | Smooth | View on Amazon |
| DORMAN | 419667 | 🇺🇸 US 🇨🇦 CA | Smooth | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FOUR SEASONS Popular | 45070 | 🇺🇸 US 🇨🇦 CA | Smooth | View on Amazon |
| GATES Popular | 36174 | 🇺🇸 US 🇨🇦 CA | Smooth | View on Amazon |
| ACDELCO | 36173 | 🇺🇸 US 🇨🇦 CA | GoldSmooth | View on Amazon |
| ACDELCO | 36174 | 🇺🇸 US 🇨🇦 CA | GoldSmooth | View on Amazon |
| CONTINENTAL | 49127 | 🇺🇸 US 🇨🇦 CA | Smooth | View on Amazon |
| CONTINENTAL | 49129 | 🇺🇸 US 🇨🇦 CA | SmoothIncludes Hardware | View on Amazon |
| DAYCO | 89158 | 🇺🇸 US 🇨🇦 CA | Smooth | View on Amazon |
| DAYCO | 89169 | 🇺🇸 US 🇨🇦 CA | Smooth | View on Amazon |
| HAYDEN | 5070 | 🇺🇸 US 🇨🇦 CA | Smooth | View on Amazon |
| LITENS | 900244A | 🇺🇸 US 🇨🇦 CA | Smooth | View on Amazon |
| LITENS | 900320A | 🇺🇸 US 🇨🇦 CA | Smooth | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACKOJA | A709732 | 🇺🇸 US 🇨🇦 CA | Alternator and Water PumpLimited or Nightshade or SR5 Model or SR5 Premium or TRD Off-Road or TRD Off-Road Premium or TRD Pro or Trail or Venture | 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.
17 Idler Pulley parts are listed for the 2021 Toyota 4RUNNER, from SKP, DORMAN, ACDELCO and 8 other brands. SKP SK89158 carries the "Popular" badge.
Economy: 5 parts, from SKP, DORMAN and AUTOTECNICA. A representative part number is SKP SK89158.
The Standard Replacement section: 11 options from ACDELCO, CONTINENTAL, DAYCO and 4 other brands. FOUR SEASONS 45070 is listed in this group.
1 ungrouped part is not assigned to a grade, with the same engine-level match.
Buying Belt Drive Parts for a 2021 Toyota 4RUNNER
On this vehicle, the belt drive system spins the accessories — serpentine and V-belts, tensioners, idlers and pulleys.
- Confirm you have the 4.0L V6 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: Idler Pulley and Belt Tensioner .
Frequently Asked Questions
How many belt drive parts fit the 2021 Toyota 4RUNNER?
Our catalog currently lists 31 belt drive parts for the 2021 Toyota 4RUNNER across 3 subcategories and 15 brands, covering the 4.0L V6 engine. Each part is matched to the engine(s) it fits.
What are the signs of belt drive problems on a 2021 Toyota 4RUNNER?
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 Toyota 4RUNNER 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 Toyota 4RUNNER?
Every part on this page is matched to the 4.0L V6 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 Toyota 4RUNNER
Belt Drive Parts for Other Toyota 4RUNNER 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.