Emissions control defeat devices policy

Products that bypass, defeat or render inoperative emission-control systems are not allowed, either on their own or when combined with other hardware or software. See the EPA Enforcement Alert for more information. Examples of such products include, but are not limited to:

• ​Tuners, services, software or devices that modify the performance of vehicles, such as cars, trucks and off-road vehicles
• Aftermarket standalone (non-OEM) electronic control unit (ECU), including full electronic fuel injection (EFI) conversion kits
• Powertrain or exhaust parts intended for “race only” or “off-road only”
• Active fuel management/Dynamic fuel management or auto start-stop disablers
• Blocking plates for emission control systems
• Products that remove factory catalytic converters (CAT) or diesel particulate filters (DPF), selective catalytic reduction (SCR) and diesel exhaust fluid (DEF)
• Throttle response controllers
• Exhaust servo eliminators
• Devices intended to bypass or reduce flow to oxygen sensors