Car MOT Checklist: What to Check Before Your Test

An MOT is an annual safety and roadworthiness inspection that many cars must pass once they reach a certain age. The test confirms that your vehicle meets minimum legal standards for safety, emissions, and general condition. If it fails, you cannot legally drive the car until the problems are fixed — and in some cases, not until it passes a retest. The reassuring part is that most failures are caused by simple, predictable issues that you can find and fix yourself before test day. This guide covers a full pre-test checklist, explains what the examiner actually looks at, and highlights the most common reasons cars fail.

What the MOT Actually Covers

The test is a visual and mechanical inspection rather than a full service. An examiner checks that key components are present, secure, and working within legal limits. There is no dismantling of the car, so anything that can be seen or operated from the outside or from the driver’s seat is fair game.

• Lights, indicators, and reflectors
• Brakes, including the parking brake
• Steering and suspension
• Tyres and wheels
• Seatbelts and their mountings
• Windscreen, wipers, and washers
• Mirrors and the driver’s field of view
• Bodywork, structure, doors, and boot
• Exhaust system and emissions
• Fuel system and fluid leaks
• Horn, battery, and dashboard warning lights
• Number plates and vehicle identification

Pre-Test Checklist: What to Check Before Your Test

Work through each section below in order. A quick walk around the car with a helper takes around 20 minutes and can save a great deal of time and money.

1. Lights and Signals

Lighting faults are among the most frequent causes of failure, and many are cheap to fix.

• Check headlights on both dipped and main beam.
• Test all indicators, including the dashboard tell-tale.
• Check brake lights with a helper pressing the pedal.
• Confirm side lights, rear lights, and number plate lights work.
• Check fog lights if fitted.
• Look at the lenses for cracks, and make sure none are excessively cloudy or misaligned.

2. Tyres and Wheels

Tyres must meet legal tread and condition requirements.

• Tread must be at least 1.6 mm across the central three-quarters of the tyre, all the way around.
• Check for cuts, bulges, exposed cords, or objects stuck in the tread.
• Make sure all tyres are correctly inflated and check the spare if one is fitted.
• Confirm wheel nuts and trim are secure.

3. Brakes

Brake performance is measured on rollers during the test, so obvious faults will show up.

• Check the brake fluid level in the reservoir.
• Look for leaks around the wheels or under the car.
• Listen for grinding or squealing, which suggests worn pads or discs.
• Test the parking brake on a slope — it should hold the car firmly.
• Make sure the pedal does not feel spongy or travel too far.

4. Steering and Suspension

• Check for excessive play in the steering wheel.
• Listen for knocking or clunking over bumps.
• Bounce each corner of the car; it should settle quickly rather than keep rocking.
• Look for broken springs or leaking shock absorbers.
• Ensure the power steering warning light is not illuminated.

5. Windscreen, Wipers, and Washers

• Any chip or crack in the driver’s direct line of sight is likely to fail.
• Smaller damage elsewhere may still fail if it affects the view or is sharp enough to injure someone.
• Wiper blades should clear the screen without smearing or leaving gaps.
• Washers must spray correctly and the reservoir must be topped up.
• Remove air fresheners, phone mounts, and dash cameras from the swept area of the screen.

6. Mirrors, Seatbelts, and Interior

• All mirrors must be present, secure, and free from serious cracks.
• Pull each seatbelt out fully and let it retract smoothly.
• Check the belt webbing for fraying, cuts, or damage.
• Make sure seats are securely mounted and can be adjusted and locked.
• Test the horn.

7. Bodywork, Doors, and Structure

• Check that all doors open and close properly from inside and outside.
• Look for sharp edges or corrosion that could cause injury.
• Check that the bonnet and boot latch securely.
• Make sure the fuel cap seals properly.
• Remove loose items or hanging accessories from mirrors.

8. Exhaust and Emissions

• Listen for blowing or rattling from the exhaust system.
• Check that mountings and brackets are secure and not badly corroded.
• Watch for excessive smoke from the tailpipe.
• An emissions test measures exhaust gases against the limits set for your car’s age and fuel type.
• Diesel vehicles are also checked for smoke density.

9. Fuel, Fluids, and Leaks

• Top up engine oil, coolant, brake fluid, and screen wash before the test.
• Look under the car for fresh drips of oil, coolant, or fuel.
• Check that the fuel filler cap and any visible fuel lines are not leaking.

10. Battery, Horn, and Warning Lights

• Make sure the battery is secure and not leaking.
• Check the horn sounds clearly and consistently.
• Switch on the ignition and note any warning lights that stay on.
• A continuously lit engine management light is a common reason for failure.

11. Number Plates and Documents

• Plates must be clean, secure, and legible, with the correct characters and spacing.
• Check that none are cracked, discoloured, or covered by a tinted cover.
• Bring your test booking details and, if possible, the reference number from your previous certificate.
• It helps to bring the vehicle registration document, though it is often not required.

Quick MOT Checklist at a Glance

1. All lights and indicators working
2. Tyres legal and correctly inflated
3. Brakes firm and free of leaks
4. Steering and suspension free of knocks
5. Windscreen clear, wipers and washers working
6. Mirrors and seatbelts secure and undamaged
7. Doors, bonnet, and boot open and latch properly
8. Exhaust secure with no excessive smoke
9. Fluids topped up and no visible leaks
10. Battery secure and warning lights off
11. Number plates clean and legible
12. Car reasonably clean with personal items removed

Common Reasons Cars Fail an MOT

Failures cluster around a small number of categories, which is why the checklist above focuses on them.

• Lighting and signalling — blown bulbs, broken lenses, and incorrect aim.
• Brakes — worn pads or discs, leaks, and weak parking brakes.
• Suspension — broken springs, worn bushes, and leaking dampers.
• Tyres — insufficient tread and sidewall damage.
• Driver’s view — windscreen chips and faulty wipers or washers.
• Emissions — exhaust faults and failing emissions readings.

Tips for Test Day

• Arrive with enough fuel so the car can run during the emissions test.
• Give the car a wash — examiners need a clear view of components and plates.
• Remove personal belongings, child seats, and clutter.
• Arrive a few minutes early and hand over the keys with any relevant paperwork.
• Fix small faults yourself before the test if you are confident doing so; otherwise, ask a qualified mechanic.
• Booking slightly before your current certificate expires can help you avoid a gap in cover.

Final Thoughts

Passing an MOT is mostly about preparation. Work through the checklist above a week or two before your test date, replace any cheap parts that are borderline, and fix the obvious problems early. Most issues are inexpensive when caught at home, and catching them in advance turns a stressful inspection into a routine appointment. If something does fail, you usually have a short window to repair it and have the car retested.

If you want more practical guides on keeping a car running smoothly, from simple maintenance routines to understanding dashboard warnings, there is plenty more to explore here.