EPA taking enforcement action on vehicle emission control ‘defeat’ devices
The Environmental Protection Agency (EPA) has identified numerous companies and individuals who have manufactured and sold both hardware and software specifically designed to defeat emissions controls on vehicles and engines used on public roads, as well as on nonroad vehicles and engines.
Cars and trucks manufactured today emit far less pollution than older vehicles due in part to emissions controls in exhaust systems. Aftermarket “defeat devices” bypass these controls and cause higher emissions. In an on-going effort to address this air quality problem, EPA has resolved more than 50 cases addressing these types of violations since 2015. Recent cases include:
- A major web-based distributor of diesel defeat device products was issued a $7 million penalty for nearly 14,000 violations of the aftermarket defeat device prohibition.
- A diesel technology company was ordered to pay a $4.1 million penalty for 5,000 violations of the aftermarket defeat device prohibition.
In recognition of the pollution caused by illegally modified vehicles and engines, EPA is implementing a National Compliance Initiative entitled Stopping Aftermarket Defeat Devices for Vehicles and Engines. Under this initiative, EPA will continue to vigorously pursue enforcement against those who violate the defeat device and tampering prohibitions of the Clean Air Act (CAA). In addition, EPA will continue to prosecute criminal activity related to the illegal sale and installation of defeat devices.
Over half the pollutants in America’s air come from mobile sources of air pollution. These include cars, trucks, buses, motorcycles, recreational vehicles, scooters, off road construction equipment, marine engines, generators, and small engines and equipment. The CAA requires new engines and equipment sold or distributed in the United States to be certified to meet EPA-established emissions requirements.
EPA enforces the CAA, including the prohibitions against devices that defeat emissions controls. Violators are subject to civil penalties up to $45,268 per noncompliant vehicle or engine, $4,527 per tampering event or sale of defeat device, and $45,268 per day for reporting and recordkeeping violations.



















































