In New Jersey, a vehicle emissions test is required every two years. The Motor vehicle Commission does not issue any reminder for the inspection. The inspection due date of the vehicle is ascertained from the sticker on the windshield which is issued once an inspection is cleared.

VEHICLES THAT REQUIRE AN EMISSIONS TEST

A car, truck, motor home, RV (recreational vehicle) or any other vehicle requires an emissions test when:

It is a new car which has completed four years.

It is a vehicle used for school transportation.

It runs on diesel and has a manufacturer’s gross vehicle weight rating of 18,000 pounds or more.

It runs on gasoline.

Emission tests are valid for two years. If the car is registered in New Jersey, the emissions test has to be undertaken in New Jersey. Getting an emissions test is the buyer’s responsibility when the vehicle is purchased from a private owner.

EXEMPTIONS

A vehicle is exempt from emissions testing when:

It is a contractor equipment in transit.

It is a new vehicle which has not completed four years.

It is a farm vehicle.

It is a vehicle operated by a county, municipality, fire district, or duly incorporated non-profit organization and used for first aid, emergency, ambulance, rescue or fire-fighting purposes.

It is a historic vehicle.

It is a collector vehicle.

Source: http://www.dmv.com/nj/new-jersey/emissions-testing