Tampering is defined as the removing or altering of emission controls on your vehicle and is prohibited pursuant to N.J.A.C. 7:27-14 and 15.

It is illegal under state and federal law to tamper with the emissions system of any vehicle. All vehicles and non-road equipment, diesel or gasoline powered, light, medium, or heavy-duty, are subject to the regulation.

Emission Control Systems

Learn about the emission control systems on vehicles that help maintain air quality

Violations and Penalties

Learn about the violations and penalties imposed for tampering with a vehicle


View pictures of tampered vehicles

Smoking Vehicles

Learn about how to report smoking vehicles

If you suspect a vehicle has been tampered with, please contact:


Division of Air Enforcement

In the Warn DEP app