The 2021 Toyota Prius has 32 electrical bulb & socket parts with verified fitment on this page — 12 part types and 4 brands, covering the 1.8L L4 ELECTRIC/GAS engine. Each part includes a manufacturer part number and application notes.
On the 2021 Toyota Prius, the bulb and socket system covers every bulb and socket on the vehicle, from headlamps to instrument-cluster illumination. 17 parts of the 32 listed are Back Up / Reverse Lamp Bulb (7 parts), Dome Light Bulb (7 parts) and Parking Lamp Bulb (3 parts). The other 9 part types cover the remaining 15 parts.
The 2021 Toyota Prius came with a single engine, the 1.8L L4 ELECTRIC/GAS, and every part is verified against it.
4 brands supply electrical bulb & socket parts for the 2021 Toyota Prius, led by PHILIPS (14 parts), SYLVANIA (8 parts) and WAGNER (5 parts), plus 1 more brand. Quality grades include Standard Replacement, LED and Extended Life.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2021 Toyota Prius. 4 parts have it, including SYLVANIA 921LL (Back Up / Reverse Lamp Bulb) and PHILIPS 12961 (Dome Light Bulb). Each part number opens a page with every vehicle that part fits.
Back Up / Reverse Lamp Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA Popular | 921LL | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Long LifeBase Type: W2.1x9.2d | View on Amazon |
| WAGNER | 921LL | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Long LifeWedge Base | View on Amazon |
Extra Bright (improved visibility, but shorter life)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | 921ST | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Cool WhiteSilver Star | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER | 921WLED | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | LEDWhite | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Popular | 921 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Bulb Type: T-5 Bulb 5/8 (16mm) DiameterVoltage: 12.800 Volts (Direct Current) | View on Amazon |
| HELLA | 7440 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | IncandescentSocket Type Bulb: W3X16D | View on Amazon |
| SYLVANIA | 921 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Base Type: W2.1x9.2dWattage: 18.00 W | View on Amazon |
This table covers the bulbs in the reverse lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
7 Back Up / Reverse Lamp Bulb parts for the 2021 Toyota Prius come from 3 brands — SYLVANIA, WAGNER and HELLA. The "Popular" part is SYLVANIA 921LL.
In the Extended Life grade, SYLVANIA and WAGNER supply 2 parts: grouped under the catalog's "Extended Life" designation — the notes column spells out what sets them apart. A representative part number is SYLVANIA 921LL.
In the Extra Bright (improved visibility, but shorter life) grade, SYLVANIA supplies 1 part: grouped under the catalog's "Extra Bright (improved visibility, but shorter life)" designation — the notes column spells out what sets them apart. A representative part number is SYLVANIA 921ST.
The LED (instant-on, long life, energy-saving) section lists 1 option from WAGNER — grouped under the catalog's "LED (instant-on, long life, energy-saving)" designation — the notes column spells out what sets them apart. WAGNER 921WLED is listed in this group.
In the Standard Replacement grade, WAGNER, HELLA and SYLVANIA supply 3 parts: built to original-equipment specification. A representative part number is WAGNER 921.
Part numbers include SYLVANIA 921LL and SYLVANIA 921ST, among others listed above.
Brake Light Bulb - High Mount
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | 194RLED | 🇺🇸 US 🇨🇦 CA | Ultinon LEDRed | View on Amazon |
This table covers the bulbs in the high-mount stop lamp. Typical signs include a clunk on takeoff, a vibration at idle, or a separated rubber insert. Support the powertrain before unbolting a mount, and torque the fasteners in the notes.
This group shows a single part: PHILIPS 194RLED.
Dome Light Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | DE3175LL | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Long LifeBase Type: SV | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | 194RLED | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Ultinon LEDRed | View on Amazon |
| SYLVANIA | DE3175BSL | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | LEDBlue | View on Amazon |
| SYLVANIA | DE3175SL | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | LEDCool White | View on Amazon |
| SYLVANIA | DE3175LED | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Cool WhiteZEVO | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS Popular | 12961 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | FrontPrius Base Model | View on Amazon |
| SYLVANIA Popular | DE3175 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Wattage: 10.00 W | View on Amazon |
This table covers the bulbs in the dome lamp. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
7 Dome Light Bulb parts for the 2021 Toyota Prius come from 2 brands — SYLVANIA and PHILIPS. The "Popular" part is PHILIPS 12961.
Extended Life: 1 part, from SYLVANIA. A representative part number is SYLVANIA DE3175LL.
The LED (instant-on, long life, energy-saving) section: 4 options from SYLVANIA and PHILIPS. PHILIPS 194RLED is listed in this group.
Standard Replacement: 2 parts, from PHILIPS and SYLVANIA. A representative part number is PHILIPS 12961.
This group includes PHILIPS 12961, SYLVANIA DE3175LL and PHILIPS 194RLED and the remaining parts above.
Door Panel Light Bulb
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | 194RLED | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Ultinon LEDRed | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | 12961 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Prius Base Model | View on Amazon |
This table covers the replacement bulbs for the Door Panel Light. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
PHILIPS supplies both parts for the 2021 Toyota Prius.
LED (instant-on, long life, energy-saving): 1 part, from PHILIPS. A representative part number is PHILIPS 194RLED.
The Standard Replacement section: 1 option from PHILIPS. PHILIPS 12961 is listed in this group.
This group includes PHILIPS 194RLED and PHILIPS 12961.
Headlamp Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA | 9005 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | HalogenSocket Type Bulb: P20D | View on Amazon |
This table covers the bulbs that light the headlamps. Typical signs include a dark lamp, a flicker over bumps, or a bulb that keeps failing on one side. Avoid touching a halogen capsule. Repeated failure in one socket is usually the socket or ground, not the bulb.
One part is listed for the 2021 Toyota Prius — HELLA 9005.
Map / Reading Light Bulb
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | 194RLED | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Ultinon LEDRed | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | 12961 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the bulbs in the map / reading lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
2 Map / Reading Light Bulb parts for the 2021 Toyota Prius come from PHILIPS.
The LED (instant-on, long life, energy-saving) section: 1 option from PHILIPS. PHILIPS 194RLED is listed in this group.
Standard Replacement: 1 part, from PHILIPS. A representative part number is PHILIPS 12961.
Listed part numbers: PHILIPS 194RLED and PHILIPS 12961.
Parking Lamp Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER | 17177LL | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Long LifeW2.1x9.5d Base | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | 12961 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | FrontPrius Base Model | View on Amazon |
| WAGNER | 17177 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | W2.1x9.5d Base5.000 Watt | View on Amazon |
This table covers the bulbs in the parking lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
3 Parking Lamp Bulb parts are listed for the 2021 Toyota Prius, from WAGNER and PHILIPS.
The Extended Life section: 1 option from WAGNER. WAGNER 17177LL is listed in this group.
The Standard Replacement section: 2 options from PHILIPS and WAGNER. PHILIPS 12961 is listed in this group.
Listed part numbers: WAGNER 17177LL, PHILIPS 12961 and WAGNER 17177.
Side Marker Light Bulb
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | 194RLED | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Ultinon LEDRed | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | 12961 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits RearPrius Base Model | View on Amazon |
This table covers the bulbs in the side-marker lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
2 Side Marker Light Bulb parts for the 2021 Toyota Prius come from PHILIPS.
The LED (instant-on, long life, energy-saving) section: 1 option from PHILIPS. PHILIPS 194RLED is listed in this group.
Standard Replacement: 1 part, from PHILIPS. A representative part number is PHILIPS 12961.
This group includes PHILIPS 194RLED and PHILIPS 12961.
Tail Lamp Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA | 7440 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | IncandescentSocket Type Bulb: W3X16D | View on Amazon |
This table covers the bulbs in the tail lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
One part is listed for the 2021 Toyota Prius — HELLA 7440.
Truck Bed Light Bulb
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | 194RLED | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Ultinon LEDRed | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | 12961 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Prius Base Model | View on Amazon |
This table covers the replacement bulbs for the Truck Bed Light. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
PHILIPS supplies both parts for the 2021 Toyota Prius.
LED (instant-on, long life, energy-saving): 1 part, from PHILIPS. A representative part number is PHILIPS 194RLED.
The Standard Replacement section: 1 option from PHILIPS. PHILIPS 12961 is listed in this group.
Listed part numbers: PHILIPS 194RLED and PHILIPS 12961.
Trunk / Cargo Area Light Bulb
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | 194RLED | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Ultinon LEDRed | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | 12961 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Prius Base Model | View on Amazon |
This table covers the bulbs in the trunk or cargo-area lamp. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
PHILIPS supplies both parts for the 2021 Toyota Prius.
LED (instant-on, long life, energy-saving): 1 part, from PHILIPS. A representative part number is PHILIPS 194RLED.
The Standard Replacement section: 1 option from PHILIPS. PHILIPS 12961 is listed in this group.
Listed part numbers: PHILIPS 194RLED and PHILIPS 12961.
Turn Signal Lamp Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA | 7440NALL | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | IncandescentLong Life | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA | 7440NA | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | IncandescentNatural Amber | View on Amazon |
This table covers the bulbs in the turn-signal lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
2 Turn Signal Lamp Bulb parts for the 2021 Toyota Prius come from HELLA.
Extended Life: 1 part, from HELLA. A representative part number is HELLA 7440NALL.
Standard Replacement: 1 part, from HELLA. A representative part number is HELLA 7440NA.
Part numbers include HELLA 7440NALL and HELLA 7440NA.
Buying Electrical Bulb & Socket Parts for a 2021 Toyota Prius
On this vehicle, the bulb and socket system covers every bulb and socket on the vehicle, from headlamps to instrument-cluster illumination.
- 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, replace bulbs in pairs so both sides age together, and put a smear of dielectric grease on the new socket contacts.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Back Up / Reverse Lamp Bulb and Dome Light Bulb .
Frequently Asked Questions
How many electrical bulb & socket parts fit the 2021 Toyota Prius?
Our catalog currently lists 32 electrical bulb & socket parts for the 2021 Toyota Prius across 12 subcategories and 4 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 bulb & socket problems on a 2021 Toyota Prius?
Common symptoms include a lamp that flickers over bumps, melted or discolored socket plastic, or bulbs that keep failing early on one side. 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 bulbs in pairs so both sides age together, and put a smear of dielectric grease on the new socket contacts.
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 repeated bulb failure in one position usually means a socket or ground problem, not bad bulbs — replace the socket rather than chase it. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 Toyota Prius
Electrical Bulb & Socket Parts for Other Toyota Prius Years
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