Hyundai Elantra Cornering Bulb Size

The Hyundai Elantra cornering light uses bulb size PY21W or P21W depending on the specific configuration of the lighting assembly. Data for the lighting components covers the range from 2022 to 2023.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2023	PY21W
2022	P21W

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Single-filament amber bulb with BAU15s bayonet base. 12V, 21W.	PY21W
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.	P21W

Other Locations

Additional Notes

The 2023 Hyundai Elantra uses the PY21W bulb for the cornering position, while the 2022 model uses the P21W. Although both bulbs share the same 12V, 21W single-filament rating under the ECE standard, they are not interchangeable due to differences in base type and light output color.
The PY21W produces amber light by design, making it a dedicated amber signalling bulb. The P21W, by contrast, produces clear light and relies on a colored lens or housing to achieve the required amber output in applicable applications.
The base type difference between these two bulbs is a critical fitment factor. The PY21W uses a BAU15s bayonet base, which has offset pins, while the P21W uses a BA15s bayonet base, which has aligned pins. A BAU15s bulb cannot seat correctly in a BA15s socket, and vice versa.
Both bulbs conform to the ECE (Economic Commission for Europe) regulation, a lighting standard recognized across Europe and numerous other markets worldwide. ECE-rated bulbs are subject to defined tolerances for voltage, wattage, and photometric output.