MOT Requirements UK: What Is Checked and What Fails

Every car in the UK needs an MOT test three years after it is first registered, and then once every twelve months. The test checks that the vehicle meets minimum roadworthiness and emissions standards on the day it is presented. It does not check mechanical condition, it does not replace servicing, and it says nothing about how the car will be next week.

Below is what the test actually covers, how the modern pass and fail grades work, whether damaged bodywork causes a failure, and what happens if you drive without a certificate.

When does a car need an MOT?

The first MOT is due on the third anniversary of the vehicle's registration date, then annually after that. The test is run by the Driver and Vehicle Standards Agency (DVSA) through approved test centres, and the certificate is recorded electronically, so anyone can check a vehicle's MOT status and history free of charge on GOV.UK.

A few variations are worth knowing:

• Some vehicles need testing from one year old, including taxis, ambulances and vehicles with more than eight passenger seats.
• You can test up to one month minus a day before expiry and keep the same renewal date.
• The maximum fee a test centre may charge for a car is capped by DVSA, and many centres charge less than the cap.
• You do not strictly need to bring the V5C logbook, but taking it avoids arguments about identification.

What does the MOT test check?

The test covers the systems that keep the car safe on the road and its emissions within limits. It is a visual and functional inspection, and the tester does not dismantle anything.

Lighting and signalling, suspension, brakes, tyres and the driver's view of the road are consistently the areas that produce most failures, and most of those items are things an owner can check in ten minutes on a driveway.

What are the MOT pass and fail categories?

Since 2018 defects are graded rather than simply listed. Understanding the grades tells you whether you can drive the car away.

The Dangerous grade is the one to watch. Even if your existing certificate is still valid for months, a Dangerous defect means the car should not leave the test centre under its own power until the fault is fixed.

Advisories are not a formality. A tyre advised at 2mm this year will be an outright failure next year, and an advisory for corrosion is a warning that a repair is coming.

Does bodywork damage fail an MOT?

Cosmetic damage on its own does not fail an MOT. Dents, scuffs, faded paint and stone chips are not tested, because the MOT is concerned with safety and structure rather than appearance.

Bodywork does cause failures in four specific situations:

• Corrosion in a prescribed area. Structural corrosion within 30cm of the mounting point of any steering, suspension, braking or seatbelt component is a failure. This is the reason arch, sill and subframe rust matters so much more than rust on a door skin.
• Sharp edges. Damage that leaves a jagged or sharp edge capable of injuring someone is a failure, which is why an accident damaged wing or a torn bumper often does not pass even though the car drives normally.
• Insecure or missing panels. A bumper hanging off its mountings, a loose arch liner or an unsecured bonnet will fail.
• Damage affecting something that is tested. A creased wing that fouls a tyre, a cracked headlamp lens letting water in, a damaged mirror, a bonnet that will not latch, or a windscreen chip in the wrong place.

On windscreens the rule is size and position. Damage larger than 10mm in the area directly swept in front of the driver, or larger than 40mm anywhere else in the swept area, is a failure.

If your car has collision damage or corrosion starting at an edge, it is worth getting it looked at before the test rather than after a failure. Our vehicle body repair service covers panel damage and rust repairs, and a smart repair will deal with the smaller scuffs and chips that are not MOT items but do let corrosion in.

What happens if your car fails its MOT?

You are given a refusal document listing every defect and its grade, and the failure is recorded on the DVSA database immediately.

What you can do next depends on your circumstances:

• If your previous certificate is still valid and nothing was graded Dangerous, you can drive the car normally while you arrange repairs, although you should not ignore a Major defect.
• If your certificate has expired, you can only drive the car to a pre booked MOT appointment or to or from a garage for repairs.
• If any defect was graded Dangerous, you must not drive the car at all until it is repaired.

For retests, the usual position is that leaving the car at the test centre and having the repairs completed by the end of the next working day gets you a free partial retest. Taking the car away and bringing it back within ten working days normally gets a free or reduced partial retest. Outside that window you pay for a full test again, so it is worth asking the centre exactly what their policy is before you drive away.

What are the penalties for driving without an MOT?

Driving without a valid MOT certificate can bring a fine of up to £1,000. If the vehicle is in a dangerous condition the penalty is considerably worse: a fine of up to £2,500, three penalty points, and the possibility of a driving ban.

There are two knock on consequences that catch people out.

You cannot tax the vehicle. The DVLA checks MOT status when road tax is renewed, so a lapsed MOT stops you taxing the car and you end up committing two offences at once.

Your insurance may not respond. A failed MOT does not by itself cancel your policy. But if you have an accident while driving a vehicle that has no valid certificate or is in an unroadworthy condition, most insurers will treat that as a breach of policy conditions and may refuse to pay for your own damage. Third party cover generally still applies because it is a legal requirement, but you could be pursued for what the insurer pays out.

How to prepare for an MOT and avoid a retest

Most failures are cheap items that were visible from the driveway. Half an hour before the test is time well spent.

• Lights. Walk round with someone pressing the pedal and the indicators. Check every bulb including number plate lights, reversing lights and rear fog lights, and clean the lenses.
• Tyres. Check tread across the width, look for cuts and bulges, and set the pressures. Check the spare is not fouling anything if it is under the boot floor.
• Wipers and washers. Torn or juddering blades fail, and an empty washer bottle fails. Top it up.
• Windscreen. Look for chips in the driver's swept area and get them filled before the test.
• Mirrors. All required mirrors present, secure and undamaged.
• Horn. Press it.
• Seatbelts. Pull each one out fully, check for fraying and confirm the inertia reel locks.
• Warning lights. Airbag, ABS, brake and engine management warning lamps that stay on are failures. So is a bulb that has been removed to hide one.
• Number plates. Correct font and spacing, clean and legible, no tinted covers.
• Boot and interior. Empty the boot so the tester can reach the spare well and the load area, and clear the footwells.
• Fuel and charge. Leave enough fuel for the emissions test, and give a diesel a decent run beforehand to get it up to temperature.

What the MOT does not cover

The MOT is often mistaken for a health check on the car. It is not, and the gap matters if you are relying on a certificate to tell you a vehicle is sound.

The test does not examine:

• The engine, gearbox, clutch or drivetrain.
• Oil, coolant and fluid levels, other than brake fluid contamination in some checks.
• The condition of the air conditioning, heater or infotainment.
• Cambelt or service intervals.
• The state of the paintwork or minor cosmetic damage.
• How much life is left in a component, only whether it currently meets the standard.

A certificate confirms the car met the minimum standard on the day it was presented. It is a floor, not a recommendation, and it is no substitute for servicing to the manufacturer's schedule.

How to check a car's MOT history before buying

Anyone can look up a vehicle's MOT record free of charge on GOV.UK using the registration number, and it is one of the most useful five minutes you can spend before buying a used car.

Look for:

• Mileage at each test. A steady progression is normal. A jump backwards, or a year where the mileage barely moved followed by a large increase, is worth questioning.
• Repeated advisories for the same item. An advisory for corrosion or a worn bush that appears three years running means it has never been dealt with.
• A cluster of failures just before a sale. Sometimes legitimate, sometimes a sign the car has been patched up to shift.
• Gaps in the record. A missing year suggests the car was off the road, which raises the question of why.
• Test locations. A car tested in a different part of the country each year has often moved between traders.

Corrosion advisories deserve particular attention on a car you intend to keep. Once rust is noted on the record it tends to reappear, and structural corrosion is one of the few MOT failures that is genuinely expensive to fix. Catching it early as a paint repair rather than late as a welding job is where our body repair work usually starts.

Which vehicles are exempt from the MOT?

A small number of vehicles do not need testing:

• Vehicles built or first registered more than 40 years ago, provided no substantial changes have been made in the last 30 years. This is a rolling exemption, and the owner declares it rather than it happening automatically.
• Electric goods vehicles registered before 1 March 2015.
• Tractors and certain agricultural vehicles.
• Some specialist and low use vehicle types.

Exemption is not the same as permission to run an unroadworthy vehicle. It remains an offence to use any vehicle on the road in a dangerous condition, and exempt owners are still responsible for keeping the car safe. Many classic owners have a voluntary test done anyway for exactly that reason.