MOT emissions fail

One of the chief causes of MOT failures due to high emission levels is a ‘bad’ or clogged catalytic converter. These clever pieces of kit transform hazardous chemicals produced during the combustion process into less harmful pollutants before they are released into the atmosphere through the car’s exhaust pipe.

What does it mean when a car fails MOT on emissions?

Any car equipped with a DPF will fail an MOT if there is either evidence it has been tampered with or if smoke of any colour can be seen coming from the exhaust. DPFs became standard on all diesel cars in 2009 to comply with Euro 5 emissions standards, though a few cars older than this may also be equipped with a DPF.

How can I reduce emissions to pass MOT?

Your car must not have visible smoke coming from the exhaust. Your car must not exceed the emissions restrictions for diesel or petrol engines. Your car’s DPF must not have been tampered with or removed. Your car must not display an engine management light, which signals a problem with the emissions system and DPF.

Is emissions light an MOT failure?

Yes, your car will fail its MOT if your Engine Management Light remains on when the engine has been started. Under the new MOT rules, it is now classed as a major fault. There are many reasons why your EML might be on, some more straightforward than others.

Why do MOT tests check exhaust emissions?

Explanation: Emission tests are carried out to make sure your vehicle’s engine is operating efficiently. This ensures the pollution produced by the engine is kept to a minimum. If your vehicle isn’t serviced regularly, it may fail the MOT emissions test.

How do I fix my emissions failure?

The next thing you can do is try using fuel additives. There are a number of fuel additives out there from all kinds of manufacturers. Try using one doesn't clean your car's engine.

How do I pass an emissions test?

How to Pass Your Emissions Test

  1. Get the “Check Engine” light to turn off. …
  2. Take your car for a spin on the highway. …
  3. Refill the Engine Oil. …
  4. Tune Your Vehicle Before the Test. …
  5. Properly Inflate Your Tires. …
  6. Check All the Fluids Before-Hand. …
  7. Clean the Engine System. …
  8. Get a Mock Inspection.

What causes car emissions to be high?

The main culprit? A faulty exhaust. Usually, your exhaust and catalytic converter work together to limit the amount of harmful gasses your engine produces. However, when your exhaust is old, worn or damaged, it’s much less effective at doing so.

Does redex help with emissions?

Redex MOT emissions reducer for Diesel cars, if used Pre-MOT before the test will help to reduce emissions so can help you pass your MOT. If your car’s emissions are too high or the warning light is on, it can be an automatic MOT fail. It also helps improve the life of your engine.

Will a service improve emissions?

Having the car regularly serviced will improve the car’s emissions, having a service involves having your engine oil changed. The engine oil is what lubricates and cleans the engine, having it changed regularly will freshen it and keep the engine running efficiently.

Why do MOT tests include a strict emission test?

Why do MOT tests include a strict exhaust emissions test? There’s a large focus, particularly within Europe, to reduce pollution levels that are produced by diesel engines. This is why certain limits were introduced to ensure that cars aren’t creating excessive emissions that could be harmful to our planet.

How are emissions measured mot?

MOT. Most vehicles have their exhaust emissions tested as part of the MOT. Usually, they’re tested using a meter. Petrol vehicles used before August 1975 and diesel vehicles used before January 1980 are tested by sight.

Does an MOT check for carbon monoxide?

As part of an MOT, they now measure the amount of carbon monoxide and hydrocarbons contained in your car’s emissions. And if you drive a diesel car, they’ll also test for nitrogen oxide (NoX) levels. Cars are getting cleaner and more efficient every year.

How can I reduce my diesel emissions for mot?

How to lower diesel emissions for MOT

  1. 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.
  2. Tyre pressure – having incorrect tyre pressure can impact your diesel emissions.

What gasses are tested on a mot?

The MOT inspection covers the vehicles emission levels. The inspector will connect the car to a computer to take readings from it’s exhaust gasses. The substances that are measured are carbon dioxide, hydrocarbons and carbon monoxide. If any of these levels are excessive then the MOT will be a failure.

What can fail an MOT 2020?

What Are The TOP 10 MOT Failures 2020?

  • Lights. A blown light bulb is one of the most common MOT failures, and one of the easiest to resolve. …
  • Windscreen wipers. Faulty windscreen wipers are another common MOT fail. …
  • Tyres. …
  • Brakes. …
  • Exhaust. …
  • Seatbelts and airbags. …
  • Steering. …
  • Suspension.

Is oil level checked in MOT?

Ensure Your Vehicle Has Enough Oil

The oil check is an important part of an MOT because without it, the garage will not be able to test emission levels. You can check this by taking a quick look under the bonnet.