Most drivers book an MOT, hand over the keys, and hope for the best. Few actually know what the tester is looking at during those 45 to 60 minutes. That's a shame, because a good chunk of MOT failures come down to small things you could have spotted, and fixed, the night before.
This MOT checklist walks through what the MOT test checks, in the order most testers work through it, so you know exactly what's being inspected and where cars usually come unstuck.
Before the list, it helps to know what the MOT isn't. It's not a general health check on your engine, clutch, or gearbox. GOV.UK is clear on this: the test focuses on the items that affect road safety and the environment, not the mechanical wellbeing of the car as a whole. You could pass an MOT with a tired clutch or a worn engine and never know it from the certificate.
With that in mind, here are the MOT inspection items that make up the bulk of every test.
Every light on the car gets checked: headlights, sidelights, brake lights, indicators, fog lights, and number plate lights. The tester looks at the condition, the correct colour, and whether each one is securely fitted and working. Headlamp aim is also checked, since misaligned headlights can dazzle oncoming drivers.
Quick check before your test: walk around the car with the engine running and ask someone to confirm each light works, including brake lights and reverse light.
This covers tyre condition, size, type, and tread depth. The legal minimum tread depth is 1.6mm across the central three quarters of the tyre, all the way round. Testers also check for cuts, bulges, and uneven wear that might point to a suspension problem, plus the security and condition of the wheels themselves.
Vehicles first used from 1 January 2012 also get a check on the Tyre Pressure Monitoring System warning light, where fitted.
Brake performance is measured on a rolling road brake tester in most garages, which gives an objective reading rather than a guess. The tester checks the condition and operation of the braking system, including the handbrake, and looks for signs of fluid leaks, worn discs, or damaged pipes and hoses.
Brakes are one of the most common reasons for a major or dangerous fail, so this is worth paying attention to if your car has felt spongy or has been pulling to one side.
The tester checks that steering components move correctly and aren't excessively worn, along with the condition of suspension parts like springs, shock absorbers, and joints. Excessive play in the steering, or a suspension component that's corroded or insecure, will show up here.
Every seatbelt gets pulled and checked for condition, operation, and secure mounting points. Seats themselves are checked to confirm they lock securely into position, since a seat that slides during braking is a genuine safety risk. Where fitted, the Supplementary Restraint System (airbags) warning light is also part of the check.
The windscreen is checked for chips and cracks that fall within the driver's line of sight, since even a small chip in the wrong spot can cause a fail. Wipers must clear the windscreen properly without smearing or juddering, and washer jets need to actually reach the glass with fluid in the reservoir.
Quick check before your test: top up the washer fluid and check that both wiper blades clear the screen in one smooth pass.
This is a two-part check. First, the physical exhaust system: it must be complete, secure, and free from serious leaks. Second, the emissions themselves are measured against limits that vary by the car's age and fuel type. Diesel cars with a diesel particulate filter (DPF) are checked to confirm the filter hasn't been removed or tampered with, which has become a stricter part of MOT requirements UK-wide in recent years.
Both number plates must be present, secure, and legible, in the correct colours (white at the front, yellow at the rear), with letters and numbers in the legally correct font and spacing. The Vehicle Identification Number also gets checked, for cars first used on or after 1 August 1980, to confirm it's present and matches the vehicle's paperwork.
The horn needs to work and sound loud enough to be heard, without an unusual tone that suggests a fault. Mirrors are checked for condition and secure fitting, and doors are checked to confirm they open, close, and latch properly from both inside and outside, including the boot or tailgate.
Finally, the tester looks over the general structure of the car for sharp edges, corrosion, or damage that could be dangerous, particularly around the driver's feet and near the fuel tank. The fuel system is checked for leaks and to confirm the fuel cap locks properly, since a car with a loose or non-locking cap will need one fitted before it can pass.
Here's the full list in one place, in roughly the order most testers work through it:
Lights (headlights, indicators, brake lights, number plate light)
Tyres and wheels (tread, condition, TPMS warning light)
Brakes (performance, condition, handbrake)
Steering and suspension
Seatbelts and seats
Windscreen, wipers, and washers
Exhaust system and emissions
Registration plates and VIN
Horn, mirrors, and doors
Bodywork, fuel system, and vehicle structure
It's worth repeating, since it trips up a lot of drivers: the MOT does not check engine condition, clutch wear, or gearbox health in any detail. A car service can pass its MOT with an engine that's on its last legs, because that's simply outside the scope of the test. If you want a wider check on your car's mechanical condition, that's a separate service booking, not part of the standard MOT.
A handful of checks the night before can be the difference between a pass and a fail:
Check all lights, including the number plate and reverse lights.
Check tread depth across all four tyres, including the spare if it's a full-size one.
Top up washer fluid and test the wipers.
Check the horn works.
Confirm your fuel cap locks properly and bring the fuel cap opener with you.
Look over the number plates for cracks, fading, or loose fittings.
None of this takes more than 15 minutes, and it clears up the failure reasons that have nothing to do with mechanical faults, just things that were missed.
Knowing this MOT checklist won't guarantee a pass, but it takes the guesswork out of what's being inspected and gives you a real shot at fixing small issues before the tester finds them. Most failures come from the same handful of items: lights, tyres, and brakes account for a large share of them every year, and all three are things you can check yourself in a driveway.
If you'd rather have a professional run through it first, Drivlu can book you in with a local, DVSA-approved garage for your MOT, and the same garage can carry out any repairs on the spot if something needs fixing. It saves a second trip and gets you back on the road with less hassle.
What does an MOT test actually check?
It checks safety-related items, including lights, tyres, brakes, steering, suspension, seatbelts, the windscreen, the exhaust and emissions, and the general structure of the car. It does not check the engine, clutch, or gearbox in detail.
What are the most common reasons cars fail their MOT?
Lighting faults, worn or damaged tyres, and brake issues make up the largest share of failures every year. Most of these are simple, low-cost fixes if you catch them before the test.
Can I check my tyre tread before an MOT myself?
Yes. The legal minimum is 1.6mm across the central three quarters of the tyre. A 20p coin pushed into the tread groove is a quick way to check at home, though a proper tread gauge is more accurate.
Do MOT requirements in the UK include checking the engine?
No. MOT test standards focus on safety and emissions, not general mechanical condition. A car can pass its MOT with engine wear that would still need attention as part of a separate service.
How long does an MOT test usually take?
Most MOT tests take between 45 minutes and an hour, depending on the vehicle and the garage. Booking in advance, rather than turning up on the day, usually means a shorter wait.
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