Owners of other Kia, Hyundai or Genesis vehicles such as the Niro, Sportage, Sedona, Telluride, Sorento, Rio, Forte, Soul, K900, Cadenza, K5, Stinger, Tucson, Santa Fe, Kona, Palisade, Elantra, Sonata, Accent, Veloster, Ioniq, Nexo, Venue, G70, G80 and G90 may also find these DIY instructions to be helpful.

The compatible replacement festoon style light bulb is part number DE3175 which is available from various manufacturers such as Sylvania, Philips and Bosch.

If you would like to have brighter vanity lights, install some DE3175 LED units which will last a lot longer than traditional incandescent bulbs.

The tools that may be needed to remove the light housing and access the bulb include a flat head screwdriver and / or a plastic pry bar tool.

The steps to replace the driver side and passenger side vanity mirror light bulbs are the same.

To prevent from tearing the headliner fabric or scratching the plastic light housing, either cover the tip of your screwdriver with  thin micro fiber cloth or instead use a plastic trim panel removal tool.

Insert the blade of your screwdriver or pry bar tool in between the outer edge of the light housing (closer to the door) and the headliner.

If you have trouble removing the light housing, you may need to use some force to push in the metal retaining clip in order to release it from the headliner.

Both the driver side and passenger side light housings have the metal retaining clips situated on the outer edge closer to the door and outside of the car.

If the old light bulb was recently turned on, be careful when you remove it. The bulb might still be hot enough to burn your fingers.

Pull the old light bulb straight out of the socket.

Push a new number DE3175 light bulb straight into the socket.

If you would like to have brighter vanity lights, install some compatible replacement DE3175 LED light bulbs.

Make sure the new bulb is securely seated in between the two metal electrical contacts.

I recommend testing the new light bulb before you re-install the light housing into the headliner.

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

Then re-insert the wires on the inner edge of the housing into the opening in the headliner.

Firmly snap in the metal retaining clip on the outer edge of the housing back into place.

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

Please check out all of my 2016-2020 Kia Optima DIY Repair & Maintenance Guides.