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Yes, the
MOT test includes an emissions check to make sure your vehicle meets the legal limits for harmful pollutants.
The type of emissions test depends on your vehicle’s age, fuel type, and engine size.
For petrol cars, testers measure the levels of carbon monoxide (CO) and hydrocarbons (HC).
For diesel vehicles, the test focuses on the amount of smoke emitted from the exhaust, using a smoke opacity test.
If your car’s emissions are too high, or if the exhaust system has leaks, damage, or a missing catalytic converter (where one was originally fitted), it can result in an MOT failure.
To give your vehicle the best chance of passing, make sure it’s well maintained, has the correct fuel and oil levels, and that you arrive at the test with a fully warmed-up engine – this can help reduce smoke and emissions during the check.