This page lists 51 electrical connector parts for the 2021 Toyota 4RUNNER, across 28 part types, covering the 4.0L V6 engine. Every part shows its brand, manufacturer part number and fitment notes.
The connector system on the 2021 Toyota 4RUNNER supplies the pigtails and connector bodies that terminate the vehicle harness at lamps, sensors and modules. The largest groups are Trailer Connector (13 parts), Ignition Coil Connector (5 parts) and ABS Wheel Speed Sensor Connector (3 parts). The other 25 part types cover the remaining 30 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 connector parts are STANDARD MOTOR PRODUCTS (25 parts), CURT (15 parts) and HOLSTEIN (4 parts), plus 6 more brands.
4 parts on this 2021 Toyota 4RUNNER page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including STANDARD MOTOR PRODUCTS S2527 (Ignition Coil Connector) and CURT 55415 (Trailer Connector). Click any part number to see every vehicle that part fits.
A/C Compressor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S2539 | 🇺🇸 US 🇨🇦 CA | with 3 Female Terminals | View on Amazon |
This table covers the harness connectors at the A/C Compressor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota 4RUNNER — STANDARD MOTOR PRODUCTS S2539.
ABS Wheel Speed Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HOLSTEIN | 2ABS4912 | 🇺🇸 US 🇨🇦 CA | Front Left | View on Amazon |
| HOLSTEIN | 2ABS4911 | 🇺🇸 US 🇨🇦 CA | Front Right | View on Amazon |
| HOLSTEIN | 2ABS4913 | 🇺🇸 US 🇨🇦 CA | Fits Rear Right | View on Amazon |
This table covers the harness connectors at each ABS wheel-speed sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
HOLSTEIN supplies the 3 ABS Wheel Speed Sensor Connector parts for the 2021 Toyota 4RUNNER.
This group includes HOLSTEIN 2ABS4912, HOLSTEIN 2ABS4911 and HOLSTEIN 2ABS4913.
Accelerator Pedal Position Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S2815 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the harness connectors at the Accelerator Pedal Position Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota 4RUNNER — STANDARD MOTOR PRODUCTS S2815.
Alternator / Generator Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S2548 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the harness connectors at the Alternator / Generator. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota 4RUNNER — STANDARD MOTOR PRODUCTS S2548.
Ambient Air Temperature Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S2825 | 🇺🇸 US 🇨🇦 CA | Harness Lengthinches: 12.5 | View on Amazon |
This table covers the harness connectors at the Ambient Air Temperature Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota 4RUNNER — STANDARD MOTOR PRODUCTS S2825.
Blower Motor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S3208 | 🇺🇸 US 🇨🇦 CA | Front | View on Amazon |
This table covers the harness connectors at the Blower Motor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota 4RUNNER — STANDARD MOTOR PRODUCTS S3208.
Camshaft Position Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S2837 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the harness connectors at the Camshaft Position Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota 4RUNNER — STANDARD MOTOR PRODUCTS S2837.
Crankshaft Position Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S2808 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the harness connectors at the Crankshaft Position Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota 4RUNNER — STANDARD MOTOR PRODUCTS S2808.
Fuel Injector Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GB REMANUFACTURING | 5188 | 🇺🇸 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 |
This table covers the harness connectors at the Fuel Injector. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota 4RUNNER — GB REMANUFACTURING 5188.
Fuel Sending Unit Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S2873 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the harness connectors at the Fuel Sending Unit. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota 4RUNNER — STANDARD MOTOR PRODUCTS S2873.
Ignition Coil Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular | S2527 | 🇺🇸 US 🇨🇦 CA | Complete Assembly | View on Amazon |
| FVP | UF487F | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| STANDARD MOTOR PRODUCTS | S3291 | 🇺🇸 US 🇨🇦 CA | with Housing | View on Amazon |
| UNITED MOTOR PRODUCTS | CON208 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WALKER PRODUCTS | 2701082 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the harness connectors at the Ignition Coil. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
5 Ignition Coil Connector parts are listed for the 2021 Toyota 4RUNNER, from STANDARD MOTOR PRODUCTS, FVP, UNITED MOTOR PRODUCTS and 1 other brand. STANDARD MOTOR PRODUCTS S2527 carries the "Popular" badge.
Part numbers include STANDARD MOTOR PRODUCTS S2527, FVP UF487F and STANDARD MOTOR PRODUCTS S3291, among others listed above.
Knock / Detonation Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 926769 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| STANDARD MOTOR PRODUCTS | S2328 | 🇺🇸 US 🇨🇦 CA | Connector Shape: Rectangular, OvalTerminal Quantity: 2 | View on Amazon |
This table covers the harness connectors at the Knock / Detonation Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
2 Knock / Detonation Sensor Connector parts are listed for the 2021 Toyota 4RUNNER, from DORMAN and STANDARD MOTOR PRODUCTS.
Listed part numbers: DORMAN 926769 and STANDARD MOTOR PRODUCTS S2328.
Manifold Pressure (MAP) Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HOLSTEIN | 2HAR0065 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| STANDARD MOTOR PRODUCTS | S2325 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the harness connectors at the Manifold Pressure (MAP) Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
2 Manifold Pressure (MAP) Sensor Connector parts are listed for the 2021 Toyota 4RUNNER, from HOLSTEIN and STANDARD MOTOR PRODUCTS.
Listed part numbers: HOLSTEIN 2HAR0065 and STANDARD MOTOR PRODUCTS S2325.
Mass Air Flow (MAF) Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S1712 | 🇺🇸 US 🇨🇦 CA | Connector Shape: Oval | View on Amazon |
This table covers the harness connectors at the Mass Air Flow (MAF) Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
This group shows a single part: STANDARD MOTOR PRODUCTS S1712.
Oxygen (O2) Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S1804 | 🇺🇸 US 🇨🇦 CA | LeftDownstream Sensor | View on Amazon |
This table covers the harness connectors at the Oxygen (O2) Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota 4RUNNER — STANDARD MOTOR PRODUCTS S1804.
Parking Aid Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | HP3985 | 🇺🇸 US 🇨🇦 CA | Handypack | View on Amazon |
| STANDARD MOTOR PRODUCTS | S1415 | 🇺🇸 US 🇨🇦 CA | Number of Splice Connectors Included: 2 | View on Amazon |
This table covers the harness connectors at the Parking Aid Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
STANDARD MOTOR PRODUCTS supplies both parts for the 2021 Toyota 4RUNNER.
This group includes STANDARD MOTOR PRODUCTS HP3985 and STANDARD MOTOR PRODUCTS S1415.
Radio Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| METRA | AXSWCHT28 | 🇺🇸 US 🇨🇦 CA | Plug And Play Harness | View on Amazon |
| METRA | 711765 | 🇺🇸 US 🇨🇦 CA | Fits To radioNon-Amplifiedor To radio | View on Amazon |
This table covers the harness connectors at the Radio. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
2 Radio Connector parts for the 2021 Toyota 4RUNNER come from METRA.
Part numbers include METRA AXSWCHT28 and METRA 711765.
Side Marker Lamp Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S1530 | 🇺🇸 US 🇨🇦 CA | Connector Shape: OvalHarness Length | View on Amazon |
This table covers the harness connectors at the Side Marker Lamp. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
This group shows a single part: STANDARD MOTOR PRODUCTS S1530.
Starter Solenoid Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S2549 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the harness connectors at the Starter Solenoid. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota 4RUNNER — STANDARD MOTOR PRODUCTS S2549.
Temperature Sender / Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S1923 | 🇺🇸 US 🇨🇦 CA | Connector Shape: RectangleWiring Harness Length (mm): 508 | View on Amazon |
This table covers the harness connectors at the Temperature Sender / Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota 4RUNNER — STANDARD MOTOR PRODUCTS S1923.
Throttle Control Actuator Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S2817 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the harness connectors at the Throttle Control Actuator. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota 4RUNNER — STANDARD MOTOR PRODUCTS S2817.
Trailer Adapter Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CURT | 57101 | 🇺🇸 US 🇨🇦 CA | 7-Way Round RV To 4-Way Flat Adapter | View on Amazon |
This table covers the harness connectors at the Trailer Adapter. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota 4RUNNER — CURT 57101.
Trailer Brake Switch Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CURT | 51362 | 🇺🇸 US 🇨🇦 CA | Brake Control Adapter HarnessIncludes OEM Connector, 2 ft. Wire, Protective Sleeve, and 12 Gauge Wire | View on Amazon |
| CURT | 51363 | 🇺🇸 US 🇨🇦 CA | Brake Control Adapter HarnessIncludes OEM Connector, 2 ft. Wire, Protective Sleeve, and 12 Gauge Wire | View on Amazon |
This table covers the harness connectors at the Trailer Brake Switch. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
CURT supplies both parts for the 2021 Toyota 4RUNNER.
Part numbers include CURT 51362 and CURT 51363.
Trailer Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CURT Popular | 55415 | 🇺🇸 US 🇨🇦 CA | Replacement 7-Way RV Blade OEM Socket | View on Amazon |
| CURT Popular | 56229 | 🇺🇸 US 🇨🇦 CA | 7-Way USCAR Electrical ConnectorLength: 24 in. | View on Amazon |
| STANDARD MOTOR PRODUCTS Popular | TC656 | 🇺🇸 US 🇨🇦 CA | with Towing PackageOE Style | View on Amazon |
| CURT | 55416 | 🇺🇸 US 🇨🇦 CA | Heavy Duty Replacement OEM 7-Way RV Blade SocketPlugs Into USCAR Socket | View on Amazon |
| CURT | 56415 | 🇺🇸 US 🇨🇦 CA | Replacement 7-Way RV Blade OEM SocketTwist-In | View on Amazon |
| CURT | 55515 | 🇺🇸 US 🇨🇦 CA | Custom Wiring ConnectorOE 4-Way Flat | View on Amazon |
| CURT | 56515 | 🇺🇸 US 🇨🇦 CA | Custom Wiring Connector5-Way Flat | View on Amazon |
| CURT | 57015 | 🇺🇸 US 🇨🇦 CA | OEM Replacement Dual-Output 7 and 4 Way ConnectorPlugs Into USCAR Socket | View on Amazon |
| CURT | 55384 | 🇺🇸 US 🇨🇦 CA | Custom Wiring Connector4-Way Flat | View on Amazon |
| CURT | 57020 | 🇺🇸 US 🇨🇦 CA | OEM Replacement Dual-Output 7 and 4 Way ConnectorPackaged | View on Amazon |
| CURT | 55774 | 🇺🇸 US 🇨🇦 CA | OEM Vehicle to Trailer Connector with Harness7-Way and 4-Way | View on Amazon |
| CURT | 56584 | 🇺🇸 US 🇨🇦 CA | Custom Wiring Harness5-Way Flat | View on Amazon |
| STANDARD MOTOR PRODUCTS | TC654 | 🇺🇸 US 🇨🇦 CA | with Towing Packagewith 7 Way | View on Amazon |
This table covers the trailer-lighting connectors at the hitch. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
13 Trailer Connector parts for the 2021 Toyota 4RUNNER come from 2 brands — CURT and STANDARD MOTOR PRODUCTS. The "Popular" part is CURT 55415.
Trailer Extension Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CURT | 56475 | 🇺🇸 US 🇨🇦 CA | Custom Wiring Harness Extension | View on Amazon |
This table covers the harness connectors at the Trailer Extension. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota 4RUNNER — CURT 56475.
Turn Signal Switch Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S2539 | 🇺🇸 US 🇨🇦 CA | Front | View on Amazon |
This table covers the harness connectors at the Turn Signal Switch. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
This group shows a single part: STANDARD MOTOR PRODUCTS S2539.
Washer Pump Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S3083 | 🇺🇸 US 🇨🇦 CA | Connector Shape: Rectangle | View on Amazon |
This table covers the harness connectors at the Washer Pump. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota 4RUNNER — STANDARD MOTOR PRODUCTS S3083.
Wiper Motor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S1423 | 🇺🇸 US 🇨🇦 CA | Front Unit | View on Amazon |
This table covers the harness connectors at the Wiper Motor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota 4RUNNER — STANDARD MOTOR PRODUCTS S1423.
Buying Electrical Connector Parts for a 2021 Toyota 4RUNNER
On this vehicle, the connector system supplies the pigtails and connector bodies that terminate the vehicle harness at lamps, sensors and modules.
- 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, use heat-shrink crimp connectors rather than twist-and-tape for any pigtail splice, especially outside the cabin.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Trailer Connector and Ignition Coil Connector .
Frequently Asked Questions
How many electrical connector parts fit the 2021 Toyota 4RUNNER?
Our catalog currently lists 51 electrical connector parts for the 2021 Toyota 4RUNNER across 28 subcategories and 9 brands, covering the 4.0L V6 engine. Each part is matched to the engine(s) it fits.
What are the signs of electrical connector problems on a 2021 Toyota 4RUNNER?
Common symptoms include intermittent faults that move when the harness is wiggled, green corrosion inside a plug, or melted connector housings near heat sources. 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, use heat-shrink crimp connectors rather than twist-and-tape for any pigtail splice, especially outside the cabin.
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 match the connector by terminal count and keyway, not just appearance — many families look identical but will not lock. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 Toyota 4RUNNER
Electrical Connector Parts for Other Toyota 4RUNNER Years
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