In 2018, the DVSA added emission tests to the MOT. MOT Centres now assess the amount of carbon monoxide and hydrocarbons in your vehicle emissions as part of an MOT. They'll also check for nitrogen oxide levels if you drive a diesel vehicle. Every year, automobiles get cleaner and more efficient. If your car is in good running order, your emissions should always be within a few per cent of what the manufacturer recommends. So, if you're driving a new vehicle, you're unlikely to fail your MOT because of emissions. However, driving an older vehicle particularly a diesel car, you risk failing an MOT due to high emissions.
If your vehicle's exhaust emissions are too high, you won't be able to receive an MOT certificate. Emissions can also be checked as part of a routine roadside inspection. The exhaust emissions of most automobiles are evaluated as part of the MOT. A gauge is usually used to test them. Vehicles manufactured before August 1975 and diesel vehicles manufactured before January 1980 are visual inspections. Your vehicle will fail the MOT if it fails the emission test. Before you may acquire an MOT certificate, you must solve the problem. We have included all types of MOT Exhaust and Emissions testing equipment to help our students' learning at our MOT Test Course training centre in Northampton. Also, in our MOT Annual Training curriculum, we had made it available about the latest trends in Exhausts and Emissions testing standards.
The exhaust system and the emissions produced by the exhaust system are both tested during the MOT. Under the new category of 'Nuisance,' the May 2018 version of the MOT Testing Manual unites exhaust emissions with noise and fluid emissions. Some vehicles may never have met the CO or HC emission standards set by the MOT. Evidence of this must be provided by the car owner, such as a letter from the vehicle manufacturer. If the vehicle owner cannot prove this, the MOT test will fail if the vehicle does not meet the emissions limitations. The MOT tester will check various elements like below
Noise Suppression System
The MOT Tester will look at the following items
• Exhaust silencers
• Under-bonnet noise deadening material.
Exhaust noise will be measured during the vehicle's emissions test or by reviewing the engine to roughly 2,500rpm or half the maximum engine speed if the top engine speed is lower on vehicles that are not subject to an emissions test. The vehicle's exhaust noise shall not be excessively higher than the noise level ordinarily expected from a similar vehicle with a standard silencer in good condition.
Spark Ignition Engine Emissions
It is a kind of MOT inspection exclusively for vehicles requiring a complete catalyst emissions test. Only visible and identifiable components will be examined, such as catalytic converters, oxygen sensors, and exhaust gas recirculation valves.
The exhaust system will fail the MOT if the following conditions exist
• A component of the system is missing or has significantly deteriorated.
• The exhaust system is insecure because mountings are missing or broken.
• There is a significant leak.
• The system produces far more noise than a comparable vehicle with a working standard system.
Diesel Compression Ignition Engine Emissions
Only apparent and recognisable components will be tested, such as diesel oxidation catalysts, diesel particle filters, exhaust gas recirculation valves, and selective catalytic reduction valves. If a diesel particulate filter has been sliced open and rewelded, it will be refused unless you can demonstrate a genuine purpose for the cut, such as filter cleaning. MOT Training for the future MOT Testers has in-depth learning in Exhaust and Emissions system.
Diesel Emissions Opacity
The MOT Tester will ensure that your vehicle is appropriately prepared for a diesel emissions test and safe to do so. If the vehicle were first utilised on or after January 1, 1980, a diesel smoke metre would be used. If the Tester determines that conducting the smoke test on the VT30 is dangerous, you will be informed of the reason for the refusal. The MOT Documentation training is also offered to our students who have registered for our MOT Test Course.
If any of the following conditions exist, the smoke test will be cancelled
• There isn't enough oil in the engine.
• The oil pressure in the engine is too low.
• Unusual engine noise exists.
• The governor has been tampered with, and the camshaft belt is poor.