The name of the car is changed to "Life, the Universe, and Everything". In Douglas Adams' science fiction comedy The Hitchhiker's Guide to the Galaxy, "42" is determined to be the "Ultimate Answer to Life, the Universe, and Everything". There is some difficulty, however, in determining the corresponding Ultimate Question.

This easter egg works on the Models S, 3, X, and Y

To activate this easter egg: The name of the car appears at the top right corner of the "About your Tesla" menu, which can be accessed by tapping the Tesla "T" at the top right of the touchscreen display. Tapping the car name gives a text box which says "Name Your Vehicle" with a text entry field below and button options "Cancel" and "Save" below that. Entering the number "42" and pressing "Save" will activate The Hitchhiker's Guide to the Galaxy Easter egg.