The 2021 Toyota 4RUNNER has 53 electrical parts with verified fitment on this page — 8 part types and 26 brands, covering the 4.0L V6 engine. Each part includes a manufacturer part number and application notes.
The electrical system on the 2021 Toyota 4RUNNER covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors. The largest groups are Alternator / Generator (17 parts), Starter Motor (12 parts) and Battery (8 parts). The other 5 part types cover the remaining 16 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 electrical parts are REMY (6 parts), TERREPOWER (5 parts) and WAI GLOBAL (3 parts), plus 23 more brands. Quality grades include Remanufactured, New and Economy.
11 parts on this 2021 Toyota 4RUNNER page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including WAI GLOBAL 11978N (Alternator / Generator) and AUTOTECNICA TY1416792 (Alternator / Generator Pulley). Click any part number to see every vehicle that part fits.
Alternator / Generator
New
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAI GLOBAL Popular | 11978N | 🇺🇸 US 🇨🇦 CA | 130 AmpsFrom 08/2020 | View on Amazon |
| WAI GLOBAL Popular | 11514N | 🇺🇸 US 🇨🇦 CA | 130 AmpsTo 08/2020 | View on Amazon |
| REMY | 94239 | 🇺🇸 US 🇨🇦 CA | with Optional Equipment130 Amps | View on Amazon |
| REMY | 94345 | 🇺🇸 US 🇨🇦 CA | Standard100 Amps | View on Amazon |
| TERREPOWER | N11517 | 🇺🇸 US 🇨🇦 CA | with Standard Equipment100 Amps | View on Amazon |
Remanufactured
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DENSO Popular | 2101190 | 🇺🇸 US 🇨🇦 CA | Reman | View on Amazon |
| DENSO Popular | 2101235 | 🇺🇸 US 🇨🇦 CA | Reman | View on Amazon |
| BOSCH | AL3389X | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| FAMOUS BRAND | 10215A | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| FAMOUS BRAND | 11514A | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| FVP | 11514 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| PURE ENERGY | 10215 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| PURE ENERGY | 11514 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| REMY | 11059 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| REMY | 11209 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| TERREPOWER | 11517 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| TERREPOWER | 11514 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
This table covers the alternators that charge the battery and run the electrical load. Typical signs include dim lights at idle, a battery lamp, or a growl from the charging pulley. Load-test the battery and inspect the belt and grounds — a bad ground mimics a failed alternator.
17 Alternator / Generator parts are listed for the 2021 Toyota 4RUNNER, from REMY, TERREPOWER, WAI GLOBAL and 5 other brands. WAI GLOBAL 11978N carries the "Popular" badge.
In the New grade, WAI GLOBAL, REMY and TERREPOWER supply 5 parts: brand-new units rather than rebuilt ones. A representative part number is WAI GLOBAL 11978N.
In the Remanufactured grade, DENSO, FAMOUS BRAND, PURE ENERGY and 4 other brands supply 12 parts: factory-rebuilt units with new wear components. A representative part number is DENSO 2101190.
Alternator / Generator Pulley
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AUTOTECNICA Popular | TY1416792 | 🇺🇸 US 🇨🇦 CA | Includes NTN/NSK Bearing | View on Amazon |
| ACDELCO | 37026P | 🇺🇸 US 🇨🇦 CA | Professional / Gold | View on Amazon |
| ACKOJA | A70230005 | 🇺🇸 US 🇨🇦 CA | Clutch Pulley | View on Amazon |
| CONTINENTAL | 49916 | 🇺🇸 US 🇨🇦 CA | SteelPully Width: 40.5mm | View on Amazon |
| LITENS | 920954A | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the pulleys on the alternator shaft. Typical signs include a growl or chirp that follows engine speed, or a pulley that will not spin freely by hand. Spin each pulley with the belt off. Roughness or play means replace it with the belt.
5 Alternator / Generator Pulley parts for the 2021 Toyota 4RUNNER come from 5 brands — AUTOTECNICA, ACDELCO, ACKOJA and 2 other brands. The "Popular" part is AUTOTECNICA TY1416792.
Listed part numbers: AUTOTECNICA TY1416792, ACDELCO 37026P and ACKOJA A70230005, plus the other parts above.
Battery
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DEKA Popular | 9A3585 | 🇺🇸 US 🇨🇦 CA | IntimidatorAGM | View on Amazon |
| DEKA Popular | 9A34R | 🇺🇸 US 🇨🇦 CA | IntimidatorAGM | View on Amazon |
| BOSCH | S6523B | 🇺🇸 US 🇨🇦 CA | AGMAGM | View on Amazon |
| DEKA | 9A24F | 🇺🇸 US 🇨🇦 CA | IntimidatorAGM | View on Amazon |
| EXIDE | MX24F | 🇺🇸 US 🇨🇦 CA | Marathon MaxBCI Group 24F | View on Amazon |
| FULLRIVER | FT84024F | 🇺🇸 US 🇨🇦 CA | BCI Group 24F(Length X Width X Height) 10.87 In x 6.77 In x 8.95 In | View on Amazon |
| FVP | P24RAGM | 🇺🇸 US 🇨🇦 CA | Platinum AGMBCI Group: 24 | View on Amazon |
| P1MAX | PMAGM24F | 🇺🇸 US 🇨🇦 CA | BCI Group 24F AGM750 CCA | View on Amazon |
This table covers the batteries listed by group size and specification. Typical signs include slow cranking, a battery lamp, or a no-start after the vehicle sat overnight. Confirm group size and terminal layout in the notes. Clean the posts and the ground before condemning the battery.
8 Battery parts for the 2021 Toyota 4RUNNER come from 6 brands — DEKA, BOSCH, EXIDE and 3 other brands. The "Popular" part is DEKA 9A3585.
Listed part numbers: DEKA 9A3585, DEKA 9A34R and BOSCH S6523B, plus the other parts above.
Battery Terminal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AUTOTECNICA | TY1318200 | 🇺🇸 US 🇨🇦 CA | Negative Terminal (New Style) | View on Amazon |
| BECK/ARNLEY | 2060001 | 🇺🇸 US 🇨🇦 CA | Positive | View on Amazon |
| BECK/ARNLEY | 2060002 | 🇺🇸 US 🇨🇦 CA | Negative | View on Amazon |
This table covers the terminals and clamps that connect cables to the battery posts.
3 Battery Terminal parts for the 2021 Toyota 4RUNNER come from 2 brands — BECK/ARNLEY and AUTOTECNICA.
This group includes AUTOTECNICA TY1318200, BECK/ARNLEY 2060001 and BECK/ARNLEY 2060002.
Keyless Entry Remote
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 99685ST | 🇺🇸 US 🇨🇦 CA | Requires Locksmith Or Additional Scan Tool To Program | View on Amazon |
This table covers the key fobs that lock, unlock and start the vehicle.
One part is listed for the 2021 Toyota 4RUNNER — DORMAN 99685ST.
Parking Aid Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular | PPS275 | 🇺🇸 US 🇨🇦 CA | Black | View on Amazon |
| MARELLI | SDP215 | 🇺🇸 US 🇨🇦 CA | Rear | View on Amazon |
| STANDARD MOTOR PRODUCTS | PPS103 | 🇺🇸 US 🇨🇦 CA | Front and Rearsilver | View on Amazon |
| TECHPRO | TO1075103 | 🇺🇸 US 🇨🇦 CA | Fits FrontAttitude Black (Code 218) | View on Amazon |
| TECHPRO | TO1075104 | 🇺🇸 US 🇨🇦 CA | Fits FrontMagnetic Gray (Code 1G3) | View on Amazon |
This table covers the ultrasonic park-aid sensors in the bumper. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors.
5 Parking Aid Sensor parts are listed for the 2021 Toyota 4RUNNER, from STANDARD MOTOR PRODUCTS, TECHPRO and MARELLI. STANDARD MOTOR PRODUCTS PPS275 carries the "Popular" badge.
Part numbers include STANDARD MOTOR PRODUCTS PPS275, MARELLI SDP215 and STANDARD MOTOR PRODUCTS PPS103, among others listed above.
Speed Sensor
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HOLSTEIN | 2VSS0053 | 🇺🇸 US 🇨🇦 CA | Vehicle Speed | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WALKER PRODUCTS | 2401024 | 🇺🇸 US 🇨🇦 CA | Includes O-Ring | View on Amazon |
This table covers the speed sensors on the transmission, transfer case or ABS ring. Typical signs include a dead speedometer, harsh transmission shifts, or a code for vehicle speed. Inspect the tone wheel and the connector before replacing the sensor.
2 Speed Sensor parts for the 2021 Toyota 4RUNNER come from 2 brands — HOLSTEIN and WALKER PRODUCTS.
The Economy section lists 1 option from HOLSTEIN — the catalog's value-priced group. HOLSTEIN 2VSS0053 is listed in this group.
In the Standard Replacement grade, WALKER PRODUCTS supplies 1 part: built to original-equipment specification. A representative part number is WALKER PRODUCTS 2401024.
This group includes HOLSTEIN 2VSS0053 and WALKER PRODUCTS 2401024.
Starter Motor
New
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TYC Popular | 119176 | 🇺🇸 US 🇨🇦 CA | Limited 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 |
| ULTRA-POWER Popular | 119176 | 🇺🇸 US 🇨🇦 CA | LimitedNightshade | View on Amazon |
| REMY | 99243 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| TERREPOWER | N19176 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WAI GLOBAL | 19176N | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Remanufactured
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PURE ENERGY Popular | 19176 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| ACDELCO | 3362263A | 🇺🇸 US 🇨🇦 CA | GoldRemanufactured | View on Amazon |
| BOSCH | SR3314X | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| DENSO | 2800391 | 🇺🇸 US 🇨🇦 CA | Reman | View on Amazon |
| FVP | 19176 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| REMY | 16371 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| TERREPOWER | 19176 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
This table covers the starter motors that crank the engine. Typical signs include no motion, a squeal, or a motor that only runs on one speed. Confirm power, ground and the control module before replacing the motor.
12 Starter Motor parts are listed for the 2021 Toyota 4RUNNER, from REMY, TERREPOWER, TYC and 7 other brands. TYC 119176 carries the "Popular" badge.
New: 5 parts, from TYC, ULTRA-POWER, REMY and 2 other brands. A representative part number is TYC 119176.
Remanufactured: 7 parts, from PURE ENERGY, ACDELCO, BOSCH and 4 other brands. A representative part number is PURE ENERGY 19176.
Buying Electrical Parts for a 2021 Toyota 4RUNNER
On this vehicle, the electrical system covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors.
- 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, clean or renew the battery terminals and grounds with any charging-system repair.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Alternator / Generator and Starter Motor .
Frequently Asked Questions
How many electrical parts fit the 2021 Toyota 4RUNNER?
Our catalog currently lists 53 electrical parts for the 2021 Toyota 4RUNNER across 8 subcategories and 26 brands, covering the 4.0L V6 engine. Each part is matched to the engine(s) it fits.
What are the signs of electrical problems on a 2021 Toyota 4RUNNER?
Common symptoms include slow cranking on cold mornings, a battery light that flickers, dim lights at idle, or a check-engine code pointing at a sensor circuit. 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, clean or renew the battery terminals and grounds with any charging-system repair.
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 test before replacing — a failed alternator and a bad ground can look identical, and sensors are frequently condemned for wiring faults. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 Toyota 4RUNNER
Electrical Parts for Other Toyota 4RUNNER Years
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