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 light bulb part numbers are as follows: Reverse # 921 and Inner Parking Light # P21/5W.

If you would like to have brighter lights, install some 921 LED and P21/5W LED bulbs.

The tools needed to access and replace the bulbs include a flat head screwdriver or a plastic pry bar tool, a Phillips head screwdriver or an 8mm socket with a 1/4" drive ratchet and a 10mm socket with a 1/4" drive ratchet.

The first two steps are to open the trunk lid and move to the side of the vehicle with the burnt out light bulb.

For this guide, I replaced the bulbs in the passenger side light housing since it requires more steps to detach the fasteners for the black plastic pull handle.

Insert the blade of a flat head screwdriver or a plastic pry bar tool into the notch.

Gently pry open the black plastic access cover.

Once the trim cover is open, you'll see the two black metal screws.

Set the two screws aside in a safe place.

Use a flat head screwdriver to pry out the smaller round center button on the pop rivet fasteners.

Once the fastener has been unlocked, you can pry out the base of the pop rivets.

Gently pull back the fabric trunk lid liner to access the back side of the inner tail light housing.

Just rotate the red / orange colored plastic bulb socket 1/4 turn in the counterclockwise direction before pulling it straight out of the housing.

Push the old light bulb down into the socket and rotate it 1/4 turn in the counterclockwise direction before pulling it straight out of the socket.

Push a new number P21/5W bayonet style parking light bulb down into the socket and rotate it 1/4 turn in the clockwise direction to secure it into place.

If you would like to have brighter inner parking lights, install some compatible replacement P21/5W LED bulbs.

Loosen the three black metal nuts by turning them in the counterclockwise direction with the 10mm socket and a 1/4" turn ratchet.

Set the three nuts aside in a safe place.

Carefully pull the light housing off the trunk lid.

Set the housing down on a soft surface such as the cargo area mat to avoid scratching the lens.

Pull the old light bulb straight out of the socket.

If you would like to have brighter reverse lights, install some compatible replacement 921 LED light bulbs.

Re-insert the socket into the housing and rotate it 1/4 turn in the clockwise direction to secure it into place.

Line up the three threaded rods on the back side of the light housing with their corresponding holes in the trunk lid.

Spin on the three nuts a few turns by hand in the clockwise direction to help prevent them from becoming cross threaded.

Tighten the three nuts in the clockwise direction with the 10mm socket and a 1/4" drive ratchet until they are snug.

Try to avoid over tightening the nuts to prevent from cracking the plastic light housing.

Replace the two screws into the "PULL" handle by turning them in the clockwise direction with a Phillips head screwdriver or an 8mm socket with a 1/4" drive ratchet.

Close the plastic cover and snap it back into place.

Then push the pop rivet into their holes in the trunk liner and through to the trunk lid.

Push in the button on the pop rivet to lock the fastener into place.

Repeat the process to secure all of the pop rivets.

To test the new light bulbs, have an assistant step on the brake pedal, turn on the parking lights (or headlights) and shift the transmission into reverse.

Tip - If you installed any LED bulbs and they don't work, try removing them from the sockets, rotating them 180 degrees and then pushing them 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 vehicle's service records.

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