The 2025 Lexus IS300 has 22 electrical bulb & socket parts with verified fitment on this page — 3 part types and 1 brand, covering the 3.5L V6 engine. Each part includes a manufacturer part number and application notes.
On the 2025 Lexus IS300, the bulb and socket system covers every bulb and socket on the vehicle, from headlamps to instrument-cluster illumination. All 22 listed parts are Step / Courtesy Light Bulb (11 parts), Trunk / Cargo Area Light Bulb (9 parts) and Turn Signal Lamp Bulb (2 parts).
Every part on this page is matched to the 3.5L V6 — the only engine offered in the 2025 Lexus IS300.
Every electrical bulb & socket part listed for the 2025 Lexus IS300 comes from SYLVANIA. Quality grades include LED, Extended Life and Standard Replacement.
5 parts on this 2025 Lexus IS300 page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including SYLVANIA 194LL (Step / Courtesy Light Bulb) and SYLVANIA 168LL (Trunk / Cargo Area Light Bulb). Click any part number to see every vehicle that part fits.
Step / Courtesy Light Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA Popular | 194LL | 🇺🇸 US 🇨🇦 CA | Long LifeBase Type: W2.1x9.2d | View on Amazon |
| SYLVANIA Popular | 168LL | 🇺🇸 US 🇨🇦 CA | Long LifeBase Type: W2.1x9.2d | View on Amazon |
Extra Bright (improved visibility, but shorter life)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | 168ST | 🇺🇸 US 🇨🇦 CA | Cool WhiteSilver Star | View on Amazon |
| SYLVANIA | 194ST | 🇺🇸 US 🇨🇦 CA | Color Temperature: 3200 KVSilver Star | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | 168SL | 🇺🇸 US 🇨🇦 CA | LEDCool White | View on Amazon |
| SYLVANIA | 194BSL | 🇺🇸 US 🇨🇦 CA | LEDBlue | View on Amazon |
| SYLVANIA | 194SL | 🇺🇸 US 🇨🇦 CA | LEDCool White | View on Amazon |
| SYLVANIA | 194BLED | 🇺🇸 US 🇨🇦 CA | BlueZEVO | View on Amazon |
| SYLVANIA | 194LED | 🇺🇸 US 🇨🇦 CA | ZEVOCool White | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA Popular | 194 | 🇺🇸 US 🇨🇦 CA | Base Type: W2.1x9.2dWattage: 3.80 W | View on Amazon |
| SYLVANIA | 168 | 🇺🇸 US 🇨🇦 CA | Base Type: W2.1x9.2dWattage: 4.90 W | View on Amazon |
This table covers the bulbs in the step and courtesy 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.
SYLVANIA supplies the 11 Step / Courtesy Light Bulb parts for the 2025 Lexus IS300. SYLVANIA 194LL carries the "Popular" badge.
The Extended Life section lists 2 options from SYLVANIA — grouped under the catalog's "Extended Life" designation — the notes column spells out what sets them apart. SYLVANIA 194LL is listed in this group.
The Extra Bright (improved visibility, but shorter life) section lists 2 options from SYLVANIA — grouped under the catalog's "Extra Bright (improved visibility, but shorter life)" designation — the notes column spells out what sets them apart. SYLVANIA 168ST is listed in this group.
In the LED (instant-on, long life, energy-saving) grade, SYLVANIA supplies 5 parts: grouped under the catalog's "LED (instant-on, long life, energy-saving)" designation — the notes column spells out what sets them apart. A representative part number is SYLVANIA 168SL.
The Standard Replacement section lists 2 options from SYLVANIA — built to original-equipment specification. SYLVANIA 194 is listed in this group.
Trunk / Cargo Area Light Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA Popular | 168LL | 🇺🇸 US 🇨🇦 CA | Long LifeBase Type: W2.1x9.2d | View on Amazon |
Extra Bright (improved visibility, but shorter life)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | 168ST | 🇺🇸 US 🇨🇦 CA | Cool WhiteSilver Star | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | 168SL | 🇺🇸 US 🇨🇦 CA | LEDCool White | View on Amazon |
| SYLVANIA | 168BLED | 🇺🇸 US 🇨🇦 CA | ZEVO | View on Amazon |
| SYLVANIA | 168BSL | 🇺🇸 US 🇨🇦 CA | LED | View on Amazon |
| SYLVANIA | 168LED | 🇺🇸 US 🇨🇦 CA | ZEVOCool White | View on Amazon |
| SYLVANIA | 168RLED | 🇺🇸 US 🇨🇦 CA | ZEVO | View on Amazon |
| SYLVANIA | 168RSL | 🇺🇸 US 🇨🇦 CA | LEDRed | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA Popular | 168 | 🇺🇸 US 🇨🇦 CA | Base Type: W2.1x9.2dWattage: 4.90 W | 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.
9 Trunk / Cargo Area Light Bulb parts for the 2025 Lexus IS300 come from SYLVANIA. The "Popular" part is SYLVANIA 168LL.
Extended Life: 1 part, from SYLVANIA. A representative part number is SYLVANIA 168LL.
Extra Bright (improved visibility, but shorter life): 1 part, from SYLVANIA. A representative part number is SYLVANIA 168ST.
The LED (instant-on, long life, energy-saving) section: 6 options from SYLVANIA. SYLVANIA 168SL is listed in this group.
Standard Replacement: 1 part, from SYLVANIA. A representative part number is SYLVANIA 168.
Listed part numbers: SYLVANIA 168LL, SYLVANIA 168ST and SYLVANIA 168SL, plus the other parts above.
Turn Signal Lamp Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | 7440ALL | 🇺🇸 US 🇨🇦 CA | AmberBase Type: W3X16D | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | 7440A | 🇺🇸 US 🇨🇦 CA | 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.
SYLVANIA supplies both parts for the 2025 Lexus IS300.
The Extended Life section: 1 option from SYLVANIA. SYLVANIA 7440ALL is listed in this group.
The Standard Replacement section: 1 option from SYLVANIA. SYLVANIA 7440A is listed in this group.
Part numbers include SYLVANIA 7440ALL and SYLVANIA 7440A.
Buying Electrical Bulb & Socket Parts for a 2025 Lexus IS300
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 3.5L 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 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: Step / Courtesy Light Bulb and Trunk / Cargo Area Light Bulb .
Frequently Asked Questions
How many electrical bulb & socket parts fit the 2025 Lexus IS300?
Our catalog currently lists 22 electrical bulb & socket parts for the 2025 Lexus IS300 across 3 subcategories and 1 brand, covering the 3.5L V6 engine. Each part is matched to the engine(s) it fits.
What are the signs of electrical bulb & socket problems on a 2025 Lexus IS300?
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 2025 Lexus IS300 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 2025 Lexus IS300?
Every part on this page is matched to the 3.5L V6 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 2025 Lexus IS300
Electrical Bulb & Socket Parts for Other Lexus IS300 Years
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