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⚡ The best PY21W bulbs in stock
Stock checked on October 6, 2026
The best PY21W bulbs in stock
OSRAM DIADEM CHROME PY21W halogen, signallamp, turn signal light, 7507DC-02B, 12V, double blister 2 pieces
OSRAM ULTRA LIFE PY21W halogen signal lamp, turn indicator light, 7507ULT-02B, 12 V passenger car, double…
SYLVANIA 1156A Long Life Miniature Bulb, (Contains 2 Bulbs)
AUXLIGHT 7507 1156(150°) BAU15S LED Bulbs Extremely Bright PY21W 12496 7507AST 2641A Replacement for Turn…
4-Pack 9-30V BAU15S PY21W 7507 High Brightness Low Power Amber Yellow LED Bulbs Replacement For Turn Signal…
YM E-Bright 1156 BAU15S 150 degree PY21W 7507 Turn Signal Led Bulb, No Hyper Flash, Front Rear light, 3014…
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Cars that use a PY21W 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 PY21W 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 PY21W bulb?
The PY21W is a 21 W, 12 V automotive bulb with a BAU15s base. It’s also sold as 1156A and 581.
Is the PY21W the same as the R5W?
No. Even if they look alike, each size has a different base (BAU15s on the PY21W) and won’t fit another size’s socket. Always buy the exact size your car takes.
Can I replace a PY21W 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).