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Hyundai Elantra Third Brake Light Bulb Replacement Guide
How to change a burnt out high mount 3rd brake light bulb in a 6th generation 2017, 2018, 2019 and 2020 Elantra.

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2018 Elantra 3rd Brake
Open Trunk Lid
Third Brake Bulb Socket
This automotive maintenance tutorial was specifically written to assist owners of the 6th generation (2017, 2018, 2019, 2020 and maybe also the 2021 model year) Hyundai Elantra sedan in changing a burnt out high mount third brake light bulb located in the housing attached to the rear deck near the trunk lid.

Owners of other Hyundai, Genesis or Kia vehicles such as the Sonata, Accent, Veloster, Ioniq, Kona, Nexo, Venue, Tucson, Santa Fe, Palisade, G70, G80, G90, Soul, Sportage, Niro, Sorento, Telluride, Rio, Forte, Optima, Stinger, Cadenza, K900, Sedona and Seltos may also find these DIY instructions to be helpful.

The compatible replacement bayonet style light bulb part number is P21W.

If you would like to have a brighter 3rd brake light, install a P21W LED bulb.

No tools are needed to access and replace the bulb.

The first step is to open the trunk lid.

Then look up at the roof of the cargo area.

The 3rd brake light bulb socket is situated behind the cargo area light housing.


1/4 Turn Counterclockwise
Remove Bulb Socket
Bulb Socket Removed
Grasp the white plastic base of the bulb socket and rotate it 1/4 turn in the counterclockwise direction before pulling it straight out of the housing.
Push Down 1/4 Turn CC
Old Light Bulb Removed
Push Down 1/4 Turn CW
Push the old light bulb straight down into the socket and rotate it 1/4 turn in the counterclockwise direction before pulling it straight out.

Install the new bayonet style number P21W light by pushing it down into the socket and rotating it 1/4 turn in the clockwise direction to secure it into place.

If you would like to have a brighter third brake light, install a compatible replacement P21W LED bulb.

Empty Bulb Housing
Install 1/4 Turn Clockwise
Test New Brake Bulb
Re-insert the bulb socket into the housing and rotate it 1/4 turn in the clockwise direction to secure it into place.

Double check that the bulb socket is securely in place.

To test the new bulb, have an assistant step on the brake pedal.

Tip - If you installed an LED bulb and it doesn't work, try removing it from the socket, rotating it 180 degrees and then pushing it back into place. Some LED bulbs are "polarized" and will only work when the "+" positive and "-" negative electrical contacts are in the correct orientation.

Be sure to write down the bulb change in your car's service records.

For more, please check out all of my 2017-2020 Hyundai Elantra DIY Repair & Maintenance Guides.

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