According to a new report from Forbes, the Department of Justice is demanding Apple, Amazon, and Google hand over “identities, addresses, and purchase histories” of more than 100,000 users of a “car tinkering app” called EZ Lynk.

The DOJ first sued EZ Lynk in 2021, accusing the company of breaking the Clean Air Act by selling “defeat devices,” which are designed to remove emissions controls on a vehicle. EZ Lynk denies its primary purpose is to help drivers circumvent emissions laws, as its apps can be used for other tweaks and software upgrades, as well as to monitor a car’s performance.