Posted on April 9th, 2018 by Rob Marshall


In light of ‘dieselgate’ and to comply with the latest EU Roadworthiness Directive, modern vehicle MoT Tests will be changing from 20th May.


New defect categories

For car owners, this brings not only a new certificate but also new terminology. Dangerous and Major items will be an MOT fail, whereas Minor items will not stop the vehicle from passing. A new design of ‘certificate’ will also be issued.


What else is the MOT inspecting?

New items are also to be included in testing. The information that we have gleaned is based, at the time of writing, on draft versions of the MOT Inspector’s manual:


  • Although diesel particulate filters continue to be checked visually, and cars thus equipped with not be permitted to emit any visible smoke, all other emission control systems that have been removed will now fail the test. This includes EGR valves.


  • Diesel emissions will be reduced on cars. All cars made after 1980 will be tested by the manufacturer-specified information, provided on the VIN plate, if fitted, provided that it is not higher than the pre-set MOT value. These are:

      1981 – June 2008: Non turbo – < 2.5m-1 Turbo – <3.0m-1

      July 2008 – December 2013 (Euro V) – All types: <1.5m-1

      January 2014 onwards (Euro VI) – All types: <0.7-1


  • Checks into tyres that are obviously underinflated (a Major), or the Tyre Pressure Warning system is defective (also a Major).


A car will also fail the test, if:


  • The brake fluid has been contaminated
  • Major fluid leaks pose an environmental risk
  • Brake pad warning lights and brake pads or discs are missing
  • Reversing lights on vehicles first used from 1st September 2009 do not switch off, when reverse gear is deselected
  • Headlight washers do not work on cars used from 1st September 2009 (if they have them)
  • Daytime running lights and fog lights are inoperative on vehicles first used from 1st March 2018 (most of these vehicles will have their first MOTs in 2021, when they are three years old)
  • HID/LED conversion kits are fitted to headlights
  • Engine management warning lamp is illuminated while engine is running
  • The floor pan is weakened seriously through corrosion
  • The engine undertray is insecure
  • Noise suppression material is loose
  • Rear drive shafts are in poor condition.


Naturally, GEM will update you on the MOT changes closer to the 20th May deadline, as many changes are still in draft form.