When you take a car or any other light motor vehicle for an MOT test, the tester ensures several things to make sure that your vehicle will remain safe. They also ensure that they meet the rules and regulations of the MOT. Another important aspect checked by the tester is emissions. They are the gases and smoke which come out of the exhaust pipe when the engine is running. These gases pollute the air and harm the environment, which makes it less eco-friendly. The government makes sure that the car passes the emission test during the MOT test to make it roadworthy. By reading this blog, you will be easily able to understand what things are included in the Class 4 MOT test to check vehicle emissions.
Most drivers don’t know that if they are unable to pass the emission test, their vehicle will fail the test. This will make you fail the MOT test certificate, and you need to get it fixed as soon as possible and go retesting. The mechanic will help to identify what is wrong with the vehicle. The issue is that most of the drivers face faulty sensors, a broken catalytic converter, or engine trouble. After getting the vehicle repaired, you can retake the emissions part for the MOT test.
Measuring Pollutants in the Exhaust
While checking the emission system during Class 4 MOT Bristol, they measure the pollutants, or we say the bad gases coming from the exhaust system. The exhaust system emits carbon monoxide (CO), hydrocarbons (HC), or we say nitrogen oxides (NOx). The technician who is testing the emission system uses a special machine called an emissions analyser. This machine is used to check how many of these gases are released from cars. If they are emitting too much, then it means the engine is not clean.
Different Tests for Petrol and Diesel Vehicles
While checking the emission system, the technician does different tests for petrol and diesel vehicles. The test depends on what type of fuel is used by your vehicle, whether it’s petrol or diesel. The petrol engine tests gases like carbon monoxide and hydrocarbons. Whereas diesel engines are mainly tested for smoke or sometimes for tiny particles in the air. This happens because petrol and diesel engines produce different types of pollution. The MOT test tells you what type of vehicle you are using and what kind of gases they are emitting.
Checking the Engine Management System
Modern vehicles have a computer system, which is known as the engine management system. This system is used to control engines and helps them to keep emissions low. While conducting the MOT Bristol, the tester checks whether this system is working properly. If there is a warning light, like an engine light, that appears on the dashboard, it means there is an issue with your engine. This means there is a problem that can affect emissions, also. This makes the vehicle fail the MOT test if the lights remain on.
Idle Engine Speed Check
While checking the emission test, the engine needs to be running at some speed when the car is not moving, but the engine is not on. This is important because the emission system changes at different engine speeds. The tester checks the idle speed of the engine. They also check whether the measurement is accurate or not. The vehicle might fail the test when the idle speed is too high or too low. This may invalidate the MOT test certificate if it does not pass the test.
Inspect the Exhaust System
While inspecting the emission system, the technician also looks for the components of the exhaust system. These components involve pipes, catalytic converters, and mufflers. The catalytic converter of the exhaust system is very important as it helps in reducing the harmful gases before they leave the exhaust pipe. This works in saving the environment from other exhaust problems and harmful air in the surroundings. If the parts of the exhaust system are broken, leaking or missing, then it can cause the vehicle to fail the emission tests.
Summing Up
The emission test is very important in the Class 4 MOT test. This helps in cleaning the air and making sure that the vehicle won’t release any harmful gases that may be responsible for polluting the environment. They follow all the rules and regulations set by the government to protect the environment. It is essential to take good care of your vehicle and have it serviced on time. This makes the car more likely to pass the emissions test. Passing the mot emission test means that your vehicle is safe for the environment. This keeps the air fresh for everyone. Always remember that the emission system is also an important part which needs to be inspected on time.
