This page lists 20 electrical parts for the 2021 Toyota Prius, across 5 part types, covering the 1.8L L4 ELECTRIC/GAS engine. Every part shows its brand, manufacturer part number and fitment notes.
On the 2021 Toyota Prius, the electrical system covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors. Most of the listed parts are Parking Aid Sensor (11 parts), Battery (4 parts) and Battery Terminal (3 parts). The other 2 part types cover the remaining 2 parts.
The 2021 Toyota Prius came with a single engine, the 1.8L L4 ELECTRIC/GAS, and every part is verified against it.
8 brands supply electrical parts for the 2021 Toyota Prius, led by STANDARD MOTOR PRODUCTS (13 parts), BOSCH (1 part) and DEKA (1 part), plus 5 more brands.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2021 Toyota Prius. 3 parts have it, including STANDARD MOTOR PRODUCTS PPS166 (Parking Aid Sensor) and STANDARD MOTOR PRODUCTS PPS169 (Parking Aid Sensor). Each part number opens a page with every vehicle that part fits.
Battery
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BOSCH | S6566B | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | AGM | View on Amazon |
| DEKA | 9A140R | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | IntimidatorAGM | View on Amazon |
| FVP | PLN1AGM | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Platinum AGMBCI Group: 140R | View on Amazon |
| MOTORCRAFT | BAGMH4 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Tested Tough AGM or Tested Tough MAX SeriesBCI Group 140R or BCI Group: 99R | 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.
4 Battery parts are listed for the 2021 Toyota Prius, from BOSCH, DEKA, FVP and 1 other brand.
Part numbers include BOSCH S6566B, DEKA 9A140R and FVP PLN1AGM, among others listed above.
Battery Cooling Fan
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GPD | 2312075 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Drive Motor Battery Pack Cooling Fan AssemblyUse with NiMH Battery System | View on Amazon |
This table covers the Battery Cooling fans. Typical signs include overheating at idle, a fan that never comes on, or a blade that hits the shroud. Confirm the fan command and the relay before replacing the assembly.
One part is listed for the 2021 Toyota Prius — GPD 2312075.
Battery Terminal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY | 2060001 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | POSITIVEFor 12 Volt Battery | View on Amazon |
| DORMAN | 926515 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Prius Base ModelPositive Terminal | View on Amazon |
| STANDARD MOTOR PRODUCTS | BP100P | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Top post, straight, positive | View on Amazon |
This table covers the terminals and clamps that connect cables to the battery posts.
3 Battery Terminal parts are listed for the 2021 Toyota Prius, from BECK/ARNLEY, DORMAN and STANDARD MOTOR PRODUCTS.
Listed part numbers: BECK/ARNLEY 2060001, DORMAN 926515 and STANDARD MOTOR PRODUCTS BP100P.
Hybrid Battery Voltage Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | BSC35 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with 2 Connectors | View on Amazon |
This table covers the Hybrid Battery Voltage sensors. 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.
One part is listed for the 2021 Toyota Prius — STANDARD MOTOR PRODUCTS BSC35.
Parking Aid Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular | PPS166 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits White PearlFront Sid | View on Amazon |
| STANDARD MOTOR PRODUCTS Popular | PPS169 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Gray | View on Amazon |
| STANDARD MOTOR PRODUCTS Popular | PPS164 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits RearSILVER | View on Amazon |
| STANDARD MOTOR PRODUCTS | PPS217 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits Front InnerPrius Base Model | View on Amazon |
| STANDARD MOTOR PRODUCTS | PPS218 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits Front OuterPrius Base Model | View on Amazon |
| STANDARD MOTOR PRODUCTS | PPS104 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear InnerPrius Base Model | View on Amazon |
| STANDARD MOTOR PRODUCTS | PPS163 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | White | View on Amazon |
| STANDARD MOTOR PRODUCTS | PPS165 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Gray | View on Amazon |
| STANDARD MOTOR PRODUCTS | PPS167 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits Prius Base ModelFront Side | View on Amazon |
| STANDARD MOTOR PRODUCTS | PPS168 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits Rear OuterPrius Base Model | View on Amazon |
| STANDARD MOTOR PRODUCTS | PPS170 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Inner | 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.
11 Parking Aid Sensor parts for the 2021 Toyota Prius come from STANDARD MOTOR PRODUCTS. The "Popular" part is STANDARD MOTOR PRODUCTS PPS166.
Buying Electrical Parts for a 2021 Toyota Prius
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 1.8L L4 ELECTRIC/GAS 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: Parking Aid Sensor and Battery .
Frequently Asked Questions
How many electrical parts fit the 2021 Toyota Prius?
Our catalog currently lists 20 electrical parts for the 2021 Toyota Prius across 5 subcategories and 8 brands, covering the 1.8L L4 ELECTRIC/GAS engine. Each part is matched to the engine(s) it fits.
What are the signs of electrical problems on a 2021 Toyota Prius?
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 Prius 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 Prius?
Every part on this page is matched to the 1.8L L4 ELECTRIC/GAS 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 Prius
Electrical Parts for Other Toyota Prius 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.