A tester needs to sit in the car during the diesel emissions rev test as a straightforward health and safety measure. Sitting properly in the car, rather than leaning in with just one foot on the accelerator, means the tester is in full control if the handbrake isn’t properly applied or the car’s accidentally left in gear. There have been rare cases where a car has moved off on its own during this part of the diesel emissions rev test because the tester wasn’t fully in the driving seat. It’s a small habit, but it protects both the tester and everyone else nearby, and it’s a habit every MOT emissions testing compliance culture should insist on.
Why does a tester need to sit in the car during the diesel emissions rev test?
