Once installed, you cannot access the content immediately until you meet certain in-game requirements:
: Look for the large Hot Wheels Expedition icon on the northern part of the Mexico map, near the Gran Caldera volcano.
: Open the app, go to your Library , filter by "Games," and look for FH5 Hot Wheels to install it manually if it didn't auto-download. Download Forza Horizon 5 Hot Wheels-P2P
: Go to the Forza Horizon 5 library page, find the "DLC" section, and ensure the Hot Wheels expansion is checked for installation.
: Manage the game and its add-ons by pressing the Menu button on the game tile, selecting "Manage game and add-ons," and checking the Hot Wheels box. How to Start the Expansion in Game Once installed, you cannot access the content immediately
Are you having the expansion in your library, or How to access hot wheels bundle in Forza 5? - Facebook
: You must finish the game's opening sequence and your first Horizon Story mission. : Manage the game and its add-ons by
Forza Horizon 5: Hot Wheels is a that can be purchased individually or as part of the Premium Edition and Expansion Bundle. Official Download and Access Methods