🛈 If you buy through our links, Amazon pays us a small commission at no extra cost to you. That’s how we keep the database running. How we choose.
📑 Contents
⚡ The best WY21W bulbs in stock
Stock checked on October 6, 2026
The best WY21W bulbs in stock
iFunyLED 10 Pack 7440 Amber Bulb, 12V WY21W, Replacement for Car Parking Side Maker Turn Signal Blinker Light…
7440 WY21W Turn Signal Light Bulb, T20 12V 21W, Amber, Pair (2)
7440A Amber Turn Signal Bulbs, T20 WY21W, 10 Pack
7440 7443 LED Bulbs Amber Yellow Turn Signal Light 12V-24V Super Bright Low Power WY21W 7440A T20 7441 7444…
2Pcs 7440 LED Bulb Amber, 7440A 7441 7440NA WY21W T20 Turn Signal Light CANBUS Error Free Anti Hyper Flash…
PHINLION 7443 Amber LED Turn Signal Bulb, 7440a 7444 Blinker Light, 2 Pack
See more WY21W bulbs on Amazon →
LuzCoche score: combines the average rating and the number of customer reviews on Amazon.
Cars that use a WY21W bulb
We don’t have any cars with this bulb in our English database yet. Search for your car to see all its bulbs.
Which WY21W to buy: standard, brighter or long life
- Standard: the classic incandescent bulb; cheap and no dashboard warnings.
- LED: whiter light and lower power draw. On turn signals and brake lights they can cause hyperflash or bulb-out warnings: choose CANbus versions or add load resistors.
- Long life: handy where bulbs are hard to reach (tail lights or dome lights).
To confirm which bulb each light on your car uses, follow the methods in how to find out which bulb your car takes.
Signal & interior bulbs
Frequently asked questions
What is a WY21W bulb?
The WY21W is a 21 W, 12 V automotive bulb with a WX3x16d base. It’s also sold as 7440A and 582A.
Is the WY21W the same as the PW24W?
No. Even if they look alike, each size has a different base (WX3x16d on the WY21W) and won’t fit another size’s socket. Always buy the exact size your car takes.
Can I replace a WY21W with an LED?
Yes, LEDs are common for turn signals, parking, license plate and dome lights. Pick CANbus versions or use load resistors to avoid hyperflash and bulb-out warnings, and keep the correct color (amber for turn signals, red for brake lights).