The headlight bulb size on a 2021 Hyundai Elantra depends on the headlight type installed in your trim. If you have halogen headlights, the low-beam bulb is typically H11 and the high-beam bulb is 9005. If your car uses LED headlights, there are no user-replaceable bulbs for the main headlights. Fog lights, when equipped, are usually H11. Always confirm with your owner's manual or by inspecting the existing bulb for your exact configuration.
Headlight system by trim
Different trims and markets use different headlight technologies. This section outlines the common configurations you may encounter on the 2021 Elantra.
- Halogen headlights (common on base trims and some markets): Low beam bulb commonly H11; high beam bulb commonly 9005 (HB3).
- LED headlights (appears on higher trims): No traditional replaceable bulb for the main headlights; the LEDs are integrated modules. If replacement is needed, service guidance from Hyundai applies.
Concluding: Halogen configurations follow the H11 low beam / 9005 high beam pattern, while LED-equipped models rely on non-serviceable LED assemblies rather than replaceable bulbs.
Bulbs for fog lights
Fog light bulb sizes, when your 2021 Elantra is equipped with fog lights, typically follow a standard pattern used by Hyundai models of this era.
- Fog lights: usually H11 bulbs.
Concluding: Fog light sizing can vary by market or trim, so verify if your vehicle includes fog lights or uses an alternative bulb specification.
How to confirm the exact bulb size for your vehicle
To ensure you purchase the correct bulb, use this checklist to verify your specific car configuration.
- Check the owner's manual under the lighting/bulb section for the exact part numbers and sizes.
- Inspect the existing bulb by removing it from the headlight housing to read the size stamped on the base.
- Use Hyundai’s official parts catalog or a reputable parts retailer, filtering by model year, trim, and headlight type.
- Contact a Hyundai dealer with your VIN if you want the precise specification for your exact build.
Concluding: Precise confirmation helps avoid buying the wrong bulb, especially on LED-equipped trims where replacements are not simple bulb swaps.
Summary
For most 2021 Hyundai Elantras with halogen headlights, anticipate H11 for low beams and 9005 for high beams, with H11 commonly used for fog lights. If your Elantra has LED headlights, there are no user-replaceable headlight bulbs—the entire LED module is serviced or replaced. Always verify using the owner's manual, the bulb itself, or a Hyundai parts source to ensure you have the correct size for your exact vehicle.