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The U.S. Department of Justice is seeking personal data on potentially hundreds of thousands of drivers who downloaded EZ Lynk’s Auto Agent app , escalating a years-long legal battle over vehicle emissions controls. Subpoenas issued to Apple, Google, Amazon, and Walmart request names, addresses, phone numbers, and purchase histories tied to the app and its accompanying hardware.

The DOJ first sued EZ Lynk in 2021, accusing the Cayman Islands-based company of violating the Clean Air Act by marketing and selling “defeat devices.” These tools allegedly allow users to bypass factory emissions controls on diesel vehicles, primarily through the EZ Lynk Auto Agent app paired with an onboard diagnostic (OBD) hardware dongle.

EZ Lynk strongly denies the allegations, emphasizing that its products serve legitimate purposes: monitoring vehicle performance, applying software updates, and enabling legitimate modifications and diagnostics. The company argues that any emissions-related use is not its primary purpose and falls under user responsibility.

According to a joint court filing earlier this month, the DOJ subpoenaed Apple and Google in March and April 2026 for download and account data on anyone who installed the Auto Agent app. Additional requests went to Amazon and Walmart for buyer information on the physical EZ Lynk hardware. Estimates suggest the total could exceed 100,000 users, Gizmodo reports .

The government says it needs this information to identify and interview witnesses who can testify about how the tools were actually used. It has already submitted forum posts and social media evidence showing some users employing the system to disable emissions controls.

EZ Lynk’s lawyers call the requests “overreach,” arguing they go far beyond what’s necessary for the case and raise serious Fourth Amendment issues. “Investigating this claim does not require identifying each person who has used the product,” they wrote. Apple and Google are reportedly preparing to challenge the subpoenas.