2017–2020 Hyundai Elantra Headlight and Bulb Sizes

Which Hyundai Elantra model years does this cover?

These headlight bulbs specifications apply to every Hyundai Elantra built from 2017 through 2020 — the AD (6th generation), compact sedan. Nothing in this specification changes between those model years. Pick your year for the engines it offered, what changed that year, and the problems recorded against it.

What changed during the 2017–2020 Hyundai Elantra

• 2017AD generation launch; 2.0L MPI base engine, 1.4T Eco introduced
• 20181.6T Sport sedan added, replacing the previous-generation naturally aspirated Sport
• 2019Facelift: new front/rear fascias, standard LED DRLs, available LED headlights on upper trims
• 2020Final model year before the CN7 redesign; carryover engines

What headlight bulb does a 2017–2020 Hyundai Elantra use?

H7 (halogen on SE/SEL/Eco; LED projector standard on Limited/Sport from the 2019 facelift) for the low beam and H1 (halogen trims); LED module on Limited/Sport post-facelift for the high beam. Trims with factory LED or HID projectors use a sealed assembly instead and are not bulb-serviceable.

Can you put LED bulbs in a 2017–2020 Hyundai Elantra?

Physically, yes, LED replacements exist in every common base. Whether they work well depends on the housing: a reflector housing designed around a halogen filament scatters LED output into oncoming traffic instead of down the road. Projector housings tolerate the swap far better. Some vehicles also flag the lower current draw as a bulb-out fault.