The "Preserving Choice in Vehicle Purchases Act" amends the Clean Air Act to limit the EPA's ability to grant waivers to state emission standards that would restrict the sale or use of new gas-powered vehicles. It prevents the EPA from including state standards under previously granted waivers if they limit gas-powered vehicle sales and requires the EPA to revoke any non-compliant waivers granted after January 1, 2022. This bill aims to ensure consumers have the option to purchase gas-powered vehicles.