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How to reduce diesel emissions for MOT

28th August 2020

What is the diesel emissions test?

As part of the UK's annual MOT test for your vehicle, there is a strict exhaust emissions test. In order to adhere to the large worldwide focus of reducing pollution levels, which are produced by diesel engines, it's imperative that your vehicle passes this test.

To ensure vehicles aren't actively creating excessive emissions, certain limits have been introduced. In May 2018, the emissions test criterion was altered due to the increasing concerns diesel emissions are having on the environment. The test now measures the concentration and amount of carbon monoxide and hydrocarbons which are being released. However, it should be noted that the older your vehicle is, the more likely it is to produce a higher level of diesel emissions.

How to pass diesel emissions test

Mot emissions test rules

The emissions test rules for MOTs state that:

  • Your vehicle must not have visible smoke coming out from the exhaust
  • Your vehicle's Diesel Particulate Filter (DPF) must not have been removed or tampered with
  • Your vehicle must not exceed the emissions restrictions for diesel engines
  • Your vehicle must not display an engine management light. This is because this light signals that there is a problem with the emissions system and/or DPF

How to lower diesel emissions for MOT

Got your MOT test coming up and wondering how to reduce diesel emissions ahead of it? These simple tips have you covered:

  • Changing your fuel - by swapping to premium fuel, you are less likely to add chemicals which remove build-up of dirt and debris, which you're likely to experience with cheaper fuel.
  • Tyre pressure - having incorrect tyre pressure can impact your diesel emissions. If your tyres are underinflated, this means the tyre may need to make an increased number of turns in order to move your vehicle effectively, as it's suffering from a lack of air. In turn, this then increases fuel usage.
  • Install a SCR - a Selective Catalytic Reduction (SCR) refers to an advanced emissions control system, which converts exhaust gases from NoX to nitrogen and water vapour. This is an effective way to reduce emissions for your vehicle.
  • Regular car services - keeping your vehicle serviced regularly is beneficial for keeping on top of your general maintenance, but it's also beneficial for passing your diesel emissions test. Locate your nearest Merityre Specialists to book in for your car service now.

Now you know how to reduce diesel emissions for MOTs, perhaps you're ready to book in for your MOT test? Locate your nearest test centre or get in touch with a member of our expert team today.