I recently bought a 2023 Kia Soul that DOES have an immobilizer key system so it is not susceptible to the recent theft issues with Kia/Hyundai vehicles. There is a sticker on the driver/passenger doors but it is barely visible. I made this tag to make sure it was obvious.
These tags use the same Immobilizer icon used by the dashboard indicator (except for piece to connect the center of the O). There are various versions depending on how you want to mount it.
The Ribbed and Smooth versions wedge between the windshield and the plastic dashboard piece. The flat side goes towards the windshield. Both versions work on my 23 Soul but don't know about other vehicles.
There is a Symbol Only version which could be stuck to the windshield with clear double sided tape. Added the STEP file so you can remix easily.
A Hanger version could be hung from mirror.
The model will not load into slicer in the correct orientation. You need to flip it over.
I printed mine in Sunlu Green PETG. It may get soft in the heat but I don't think it will go anywhere.
Edit: 3-28-23, Added versions with 2023, 2024 model year dates. Some have text cut part-way through for 2 color printing. Print first half in bright color, second half in black so it's not distracting.
The author marked this model as their own original creation.