Vehicles fitted with a different engine
This inspection applies to all spark ignition engined vehicles with four or more wheels in Classes IV and VII.
Contained within this section are flowcharts. Carefully use these flowcharts to accurately establish which type of emission test is applicable to the vehicle being tested-
Test according to which is older, engine or vehicle.
e.g. A 1995 car fitted with a 1991 engine (of whatever make), test to 1991 standards for emission purposes.
Note: The onus is on the vehicle presenter
to prove engine age.
From the MOT tester's handbook
