Tests For Diesel-Powered Vehicles
There will be test centers specially equipped to perform diesel emissions tests conveniently located throughout the state.
Diesel vehicles that are model year 1997 and newer AND under 8,501 lbs. will receive an on-board computer diagnostic test.
Diesel vehicles under 8,501 lbs. and 1996 and older will receive a dynamometer test if they operate in two-wheel drive and are non-traction controlled. A modified test will be used if the vehicle is four-wheel drive and has non-disengageable traction control.
These diesel tests use an opacity meter to measure the density of smoke from a vehicle's tailpipe. The darker the smoke, the more it is polluting and the higher its opacity reading will be.
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