Q plate does not mean visual emission inspection please don’t go round telling new builders this as it is wrong! There are several different tests regardless of q plate or not!!
Class 1
if the engine fitted to the car is pre 1975 then it’s a simple smoke test.
Class 2
if your engine is pre august 1992 you need don’t need a cat but your Carbon and hydro carbon emissions will be tested!!!
if the engine was built From AUGUST 1975 to AUGUST 1986 then the carbon emissions must be below 4.5 and hydro carbons below 1200ppm with no lambda test
if the engine was built From AUGUST 1986 to AUGUST 1992 then the carbon limit is 3.5 and hydro carbons below 1200ppm with no lambda test
Class 3
if your engine is post 1992 then it must have a cat fitted and will have a full emissions test carbon, hydro carbon and lambda. Carbon must be below 0.5, Hydro Carbon must be below 200ppm and lambda must be between 0.97-1.03
when you present the car for sva, written documentation proving the engines age must be presented. This either needs to be obtained from the manufacturer of the engine or proven some other way. if you cannot prove the age of the engine it will be tested under the Class 3 post 1992 regulations so be warned!!
There is only one other thing to worry about and that’s if you want a brand new current date registration. If you build a brand new car with all new parts including new engine too get a new plate. The engine will be tested on the today’s current euro emissions regulations not the post 1992 regs!! The only way to get round it is to fit a reconditioned engine as you are allowed one major reconditioned part! Meaning you will revert back to the class 1,2,3 regs depending on engine age due to amateur build status relaxations on emissions.
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