Skip to main content
N I Direct government services

Main navigation

  • Home
  • News
  • Contacts
  • Help
  • Twitter
  • Facebook
  • YouTube
  • RSS

Translation help

Translate this page

Select a language

  • Afrikaans — Afrikaans
  • Albanian — Shqip
  • Amharic — አማርኛ
  • Arabic — العربية
  • Armenian — Հայերեն
  • Assamese — অসমীয়া
  • Aymara — Aymar aru
  • Azerbaijani — Azərbaycan dili
  • Bambara — Bamanankan
  • Basque — Euskara
  • Belarusian — Беларуская
  • Bengali — বাংলা
  • Bhojpuri — भोजपुरी
  • Bosnian — Bosanski
  • Bulgarian — Български
  • Cantonese — 廣州話
  • Catalan — Català
  • Cebuano — Sinugbuanong Binisayâ
  • Chichewa — Chichewa
  • Chinese (Simplified) — 简体中文
  • Chinese (Traditional) — 繁體中文
  • Corsican — Corsu
  • Croatian — Hrvatski
  • Czech — Čeština
  • Danish — Dansk
  • Dhivehi — ދިވެހި
  • Dogri — डोगरी
  • Dutch — Nederlands
  • English — English
  • Esperanto — Esperanto
  • Estonian — Eesti
  • Ewe — Eʋegbe
  • Filipino — Filipino
  • Finnish — Suomi
  • French — Français
  • Frisian — Frysk
  • Galician — Galego
  • Georgian — ქართული
  • German — Deutsch
  • Greek — Ελληνικά
  • Guarani — Avañe’ẽ
  • Gujarati — ગુજરાતી
  • Haitian Creole — Kreyòl ayisyen
  • Hausa — Hausa
  • Hawaiian — ʻŌlelo Hawaiʻi
  • Hebrew — עברית
  • Hindi — हिन्दी
  • Hmong — Hmoob
  • Hungarian — Magyar
  • Icelandic — Íslenska
  • Igbo — Asụsụ Igbo
  • Ilocano — Ilokano
  • Indonesian — Bahasa Indonesia
  • Irish — Gaeilge
  • Italian — Italiano
  • Japanese — 日本語
  • Javanese — Basa Jawa
  • Kannada — ಕನ್ನಡ
  • Kazakh — Қазақ тілі
  • Khmer — ភាសាខ្មែរ
  • Kinyarwanda — Ikinyarwanda
  • Konkani — कोंकणी
  • Korean — 한국어
  • Krio — Krio
  • Kurdish (Kurmanji) — Kurdî
  • Kurdish (Sorani) — کوردی
  • Kyrgyz — Кыргызча
  • Lao — ລາວ
  • Latin — Latina
  • Latvian — Latviešu
  • Lingala — Lingála
  • Lithuanian — Lietuvių
  • Luganda — Luganda
  • Luxembourgish — Lëtzebuergesch
  • Macedonian — Македонски
  • Maithili — मैथिली
  • Malagasy — Malagasy
  • Malay — Bahasa Melayu
  • Malayalam — മലയാളം
  • Maltese — Malti
  • Maori — Māori
  • Marathi — मराठी
  • Meiteilon (Manipuri) — ꯃꯤꯇꯩ ꯂꯣꯟ
  • Mizo — Mizo ṭawng
  • Mongolian — Монгол хэл
  • Myanmar (Burmese) — မြန်မာစာ
  • Nepali — नेपाली
  • Norwegian — Norsk
  • Odia (Oriya) — ଓଡ଼ିଆ
  • Oromo — Afaan Oromoo
  • Pashto — پښتو
  • Persian — فارسی
  • Polish — Polski
  • Portuguese — Português
  • Punjabi — ਪੰਜਾਬੀ
  • Quechua — Runa Simi
  • Romanian — Română
  • Russian — Русский
  • Samoan — Gagana Samoa
  • Sanskrit — संस्कृतम्
  • Scots Gaelic — Gàidhlig
  • Sepedi — Sepedi
  • Serbian — Српски
  • Sesotho — Sesotho
  • Shona — Shona
  • Sindhi — سنڌي
  • Sinhala — සිංහල
  • Slovak — Slovenčina
  • Slovenian — Slovenščina
  • Somali — Soomaali
  • Spanish — Español
  • Sundanese — Basa Sunda
  • Swahili — Kiswahili
  • Swedish — Svenska
  • Tajik — Тоҷикӣ
  • Tamil — தமிழ்
  • Tatar — Татар теле
  • Telugu — తెలుగు
  • Thai — ไทย
  • Tigrinya — ትግርኛ
  • Tsonga — Xitsonga
  • Turkish — Türkçe
  • Turkmen — Türkmençe
  • Twi — Twi
  • Ukrainian — Українська
  • Urdu — اردو
  • Uyghur — ئۇيغۇرچە
  • Uzbek — Oʻzbekcha
  • Vietnamese — Tiếng Việt
  • Welsh — Cymraeg
  • Xhosa — IsiXhosa
  • Yiddish — ייִדיש
  • Yoruba — Yorùbá
  • Zulu — IsiZulu
  • Breadcrumb

    1. Home
    2. Motoring
    3. MOT and vehicle testing
    4. About the MOT scheme

    Vehicle test procedures

    Detailed information on what happens at each stage of a vehicle test (MOT).

    Temporary Exemption Certificates (TECs) – Private cars only

    From 1 June 2025 some vehicles will receive a Temporary Exemption Certificate (TEC), extending the validity of their MOT.

    Further information can be found on the Guide to booking your MOT/ vehicle test page.

    When you arrive at the test centre

    The link below has information on what happens when you arrive at the test centre and what you can expect.

    • On the day of the MOT test

    Stage one

    The vehicle examiner will take your vehicle through the MOT Test. On entering the inspection hall, the vehicle details will be checked and recorded on computer. The vehicle's exhaust emissions will be checked first.

    Diesel smoke test

    The smoke emitted from all diesel-engined heavy goods vehicles and buses (including rigid goods vehicles, articulated goods vehicles, road construction vehicles, tower wagons, breakdown vehicles, motor tractors, mobile cranes, display vehicles, large passenger carrying vehicles, omnibuses and play buses) is assessed for its density. It is carried out by the use of an approved and calibrated smoke meter. 

    The engine will be accelerated up to governed speed and the density of the smoke measured.

    After the third acceleration the average reading is recorded. If the reading is below 2.5m-1 for non-turbocharged engines or 3.0m-1 for turbocharged engines the vehicle will pass.

    Diesel vehicles first used from 1 July 2008 to 1 January 2014 must have a reading of 1.50, and those vehicles first used on or after 1 January 2014 must have a reading of below 0.7m-1.

    If the average is higher, a further acceleration is carried out and the average of the last three readings are used, this will continue until a maximum of six accelerations have been carried out.

    If the average of the fourth, fifth and sixth acceleration is higher than the right level the vehicle will not pass the test.

    Also, any of the following will result in the vehicle being refused a certificate:

    • exhaust emits too much smoke or vapour of any colour, to an extent likely to obscure vision
    • emissions cannot be measured because a tail pipe is damaged or an accessory is fitted which prevents the insertion of the smoke meter probe
    • insufficient oil in the engine or low oil pressure which could cause engine damage if engine is accelerated
    • obvious signs of an engine defect such as an unusual noise or emission of smoke
    • obvious signs that the governors have been tampered with or are not operating

    It is important that vehicles are properly maintained (including changing of timing belts) in line with the manufacturers' recommendation and presented for test at normal working temperature.

    Petrol exhaust emission

    This test applies to all petrol-engined cars, taxis, minibuses and ambulances with up to 12 passenger seats, and other vehicles up to and including 3,500 kg design gross weight (DGW), which are petrol (spark ignition) engined with four or more wheels.

    Any of the following points will result in the vehicle being refused a certificate:

    • engine is idling at a speed clearly above its normal idling speed
    • engine emits dense blue or clearly visible black smoke for a continuous period of five seconds at idle
    • engine emits dense blue or clearly visible black smoke during acceleration, which would obscure the view of other road users
    • emissions cannot be measured because the tailpipe is damaged or an accessory is fitted which prevents insertion of the analyser probe
    • exhaust gas contains one or more gases more than the required limits for the test

    Under-bonnet inspection

    An under-bonnet inspection is carried out at this stage.

    Also checked at this stage:

    • registration plates and vehicle identification number (VIN)
    • power assisted steering
    • engine transmission mounts
    • mechanical brake components
    • hydraulic, air and vacuum brake systems
    • fuel system
    • brake and steering fluids
    • general condition of the vehicle
    • vehicle structural integrity and construction

    Additional mirrors on heavy goods vehicles

    Trucks over 3.5 tonnes and first registered on or after 1 January 2000 need to be fitted with a wide angle mirror and a close proximity mirror - both mirrors are to be fitted on the nearside of the vehicle.

    These additional mirrors are needed to help drivers see other road users in the areas immediately around their vehicles to reduce the potential for collisions.

    Stage two

    The second stage of your vehicle MOT test starts with the headlight alignment check.

    At this stage the following items will also be checked by the examiner:

    • headlamps
    • direction indicators
    • stop lamps
    • reversing lamp
    • rear reflectors
    • seat belts
    • seats including driver's seat adjustment mechanism
    • windows and windscreen
    • windscreen washers and wipers
    • horn
    • mirrors
    • hazard warning lamps
    • front and rear position lamps, registration plate lamps and front and rear fog lamp
    • daytime running lamps
    • body condition
    • doors, boot lid and bonnet
    • steering column lock
    • trailer tow bar and electrical connections
    • general condition of vehicle
    • vehicle structural integrity and construction

    Headlamp alignment testing criteria

    The most common type of headlamps fitted to vehicles are those known as European type headlamps which are checked for aim on the dip beam.

    These headlamps have an asymmetric dipped beam pattern with a distinctive horizontal cut-off on the right, and a 15 degree wedge of light above the horizontal (the 'kick-up') towards the left.

    Any of the following points will result in the vehicle being refused a certificate:

    • beam pattern blurred and does not show a distinctive cut-off point
    • beam 'kick-up' is to the offside, that is, the headlamp dips to the right
    • image break point is not between the vertical -2.0 per cent line (blue vertical line) and the vertical 0 per cent line (black vertical line)
    • headlamp centres not more than 850mm above the ground - the beam horizontal cut-off line (pitch) is not between -0.5 per cent and -2 per cent line (red lines)
    • headlamp centres more than 850mm above the ground - the beam horizontal cut-off line (pitch) is not between -1.25 per cent and -2.75 per cent line (green lines)

    There will be no opportunity to adjust headlamp alignment during the test. Levelling devices should be set for unladen condition, normally located on vehicle dash.

    After the lights have been inspected you will be asked to leave your vehicle and open the fuel cap (this is to inspect the seal on the cap as many accidents have been caused by fuel spillages) and the car boot.

    The boot should be free of luggage to allow the examiner to inspect the boot floor and body structure.

    The examiner will now drive your car forward to stage three.

    Stage three

    The third stage of your vehicle MOT test starts with the shock absorber test.

    Brake test

    The examiner will take the vehicle through the break test where the wheels will be placed on rollers and the brakes applied.

    Brakes testing criteria

    Any one of the following points about brake performance will result in a vehicle being refused a certificate:

    • low braking effort recorded from the brake on any wheel, indicating clearly that the brake is not functioning correctly
    • significant braking effort recorded on road-wheels, even though the brake is not applied, indicating that a brake is binding
    • evidence of severe brake grabbing or judder as the service brake (foot brake) is applied
    • the service braking efforts at the road-wheels do not increase at about the same rate when the service brake pedal is applied gradually
    • the service braking efforts at the road-wheels do not reduce at about the same rate when the service brake pedal is released gradually
    • the out-of-balance of the service brakes on any axle, greater than 30 per cent
    • the service brake efficiency is below 50 per cent (58 per cent for cars first used on or after 1 January 2012)
    • the parking brake (hand brake) efficiency is below 16 per cent

    When the brake test is complete the examiner will drive forward and stop in front of the hoist. They will then ask you to take a seat in the waiting area where you can watch the rest of the test being carried out. Stay here until the examiner has completed the inspection and called you forward.

    Interior inspection

    At this stage the driver's compartment will also be inspected, which will include:

    • parking brake lever mechanism (hand brake)
    • service brake control
    • speedometer
    • disabled driver control if applicable
    • driver controls
    • steering control
    • vehicle warning lights including, engine management system, anti-lock braking system, electronic braking system, electronic power steering, electronic stability control, electronic park brake, brake fluid warning lamp, tyre pressure monitoring system, air bag, seat belt pre-tensioner and seat belt load limiter
    • vehicle tell-tale lights including, hazard lamps, head lamp main beam, direction indicators and rear fog lamps

    Stage four

    The examiner will position your vehicle on the hoist for the under-body inspection.

    Under-body inspection

    An under-body inspection will look at the items listed below and could include the examiner taking the vehicle for a short road test within the test centre grounds.

    The following items are looked at:

    • electrical wiring
    • body condition
    • steering system
    • tyres
    • road wheels and hubs
    • suspension, wheel bearings and drive shafts
    • shock absorbers
    • oil leaks
    • engine and transmission mounts
    • transmission
    • exhaust system including the catalytic converter and diesel particulate filter
    • mechanical brake components
    • brake hydraulic, air and vacuum systems
    • fuel system
    • spare wheel and carrier
    • general condition of vehicle
    • vehicle structural integrity and construction

    The list above of items that are checked at each stage of the inspection are not exhaustive but identifies the main items that will be inspected.

    Diesel particulate filter

    A diesel particulate filter (DPF) is a device fitted to a diesel vehicle which filters particulate matter from exhaust gases.

    The inspection of the exhaust system carried out during the MOT test includes a check for the presence of a DPF.

    A missing DPF, where one was fitted when the vehicle was built, will result in an MOT failure.

    Removal of a DPF will also make the vehicle illegal for road use.

    A vehicle might still pass the MOT visible smoke emissions test, which is primarily intended to identify vehicles that are in a very poor state of repair, whilst emitting illegal and harmful levels of fine exhaust particulate.

    • Diesel particulate filters guidance

    Your vehicle could be randomly selected for a re-check by centre management at the end of the test. If your vehicle is chosen it will go back through the MOT testing process as part of a quality control to make sure that standards are maintained.

    • On the day of the MOT test

    The examiner will then advise if your vehicle has passed or failed.

    If your vehicle passes the MOT test, the examiner will issue you with an MOT certificate. You no longer receive a MOT disc to display on the windscreen.

    The MOT certificate may list any minor defects which will have no significant effect on safety or the environment. This will allow you to address these faults in good time, to prevent them developing into more serious problems.  

    If your vehicle does not pass the MOT test, the examiner will give you a record sheet containing details of the faults which will have to be repaired for the retest.

    You can book a retest at the first link below, at a reduced fee within 21 days of failing the full test, or else you'll have to pay the full fee again.

    Where a retest is booked at the reduced fee, the test must be carried out within 60 days of the original, failed, test.

    More useful links

    • Book an MOT/ vehicle test online
    • After the MOT/ vehicle test
    Share this page Share on Facebook (external link opens in a new window / tab) Share on X (external link opens in a new window / tab) Share by email (external link opens in a new window / tab)

    About the MOT scheme

    • After the MOT/ vehicle test
    • Driving and vehicle test centres
    • How the MOT scheme works
    • On the day of the MOT test
    • The MOT certificate
    • Vehicle test fees
    • Vehicle test procedures

    Help improve this page - send your feedback

    What do you want to do?
    Report a problem
    Which problem did you find on this page? (Tick all that apply)

    Messages

    You will not receive a reply. We will consider your feedback to help improve the site.

    Don't include any personal or financial information, for example National Insurance, credit card numbers, or phone numbers.

    What is your question about?

    What to do next

    Comments or queries about angling can be emailed to anglingcorrespondence@daera-ni.gov.uk 

    If you have a comment or query about benefits, you will need to contact the government department or agency which handles that benefit.  Contacts for common benefits are listed below.

    Carer's Allowance

    Call 0800 587 0912
    Email 
    dcs.incomingpostteamdhc2@nissa.gsi.gov.uk

    Discretionary support / Short-term benefit advance

    Call 0800 587 2750 
    Email 
    customerservice.unit@communities-ni.gov.uk

    Disability Living Allowance

    Call 0800 587 0912 
    Email dcs.incomingpostteamdhc2@nissa.gsi.gov.uk

    Employment and Support Allowance

    Call 0800 587 1377

    Jobseeker’s Allowance

    Contact your local Jobs & Benefits office

    Personal Independence Payment

    Call 0800 587 0932

    If your query is about another benefit, select ‘Other’ from the drop-down menu above.

    Comments or queries about the Blue Badge scheme can be emailed to bluebadges@infrastructure-ni.gov.uk or you can also call 0300 200 7818.

    For queries or advice about careers, contact the Careers Service.

    For queries or advice about Child Maintenance, contact the Child Maintenance Service.

    For queries or advice about claiming compensation due to a road problem, contact DFI Roads claim unit.

    If you can’t find the information you’re looking for in the Coronavirus (COVID-19) section, then for queries about:

    • Restrictions or regulations — contact the Department of Health
    • Travel advice (including self-isolation) — contact the Department of Health
    • Coronavirus (COVID-19) vaccinations — contact the Department of Health or Public Health Agency

    If your query is about another topic, select ‘Other’ from the drop-down menu above.

    For queries about your identity check, email nida@nidirect.gov.uk and for queries about your certificate, email covidcertni@hscni.net.

    For queries or advice about criminal record checks, email ani@accessni.gov.uk

    Application and payment queries can be emailed to ema_ni@slc.co.uk

    For queries or advice about employment rights, contact the Labour Relations Agency.

    For queries or advice about birth, death, marriage and civil partnership certificates and research, contact the General Register Office Northern Ireland (GRONI) by email gro_nisra@finance-ni.gov.uk

    For queries about your GRONI account, email gro_nisra@finance-ni.gov.uk.

    For queries about the High Street Spend Local Scheme,  email HSSS.mail@economy-ni.gov.uk.

    For queries about:

    • Car tax, vehicle registration and SORN
      contact the Driver and Vehicle Licensing Agency (DVLA), Swansea
       
    • Driver licensing and tests, MOT and vehicle testing
      contact the Driver & Vehicle Agency (DVA), Northern Ireland

    If your query is about another topic, select ‘Other’ from the drop-down menu above.

    For queries about your identity check, email nida@nidirect.gov.uk.

     

    For queries or advice about passports, contact HM Passport Office.

    For queries or advice about Penalty Charge Notices (PCNs), including parking tickets and bus lane PCNs, email dcu@infrastructure-ni.gov.uk

    For queries or advice about pensions, contact the Northern Ireland Pension Centre.

    If you wish to report a problem with a road or street you can do so online in this section.

    If you wish to check on a problem or fault you have already reported, contact DfI Roads.

    For queries or advice about historical, social or cultural records relating to Northern Ireland, use the Public Record Office of Northern Ireland (PRONI) enquiry service.

    For queries or advice about rates, email LPSCustomerTeam@lpsni.gov.uk

    For queries or advice about  60+ and Senior Citizen SmartPasses (which can be used to get concessionary travel on public transport), contact Smartpass - Translink.

    If you have a question about a government service or policy, you should contact the relevant government organisation directly.  We don't have access to information about you.

    Related sites

    • gov.uk
    • nibusinessinfo.co.uk

    Links to supporting information

    • Accessibility statement
    • Crown copyright
    • Terms and conditions
    • Privacy
    • Cookies
    • Twitter
    • Facebook
    • YouTube
    • RSS