MOT & ROADWORTHINESS · LAST REVIEWED: JUNE 2026
TL;DR: A pre MOT checklist focuses on the quick, visible items that cause many avoidable failures: lights, tyres, wipers, washer fluid, number plates and warning lamps. None of these replace the test itself, but checking them first can save a retest.
Working through a pre MOT checklist before the test does not change the outcome of the inspection, but it does help a driver catch the small faults that most often turn a pass into a fail. A surprising share of MOT failures involve simple items such as a blown bulb or a worn wiper blade rather than major mechanical problems.
The checks below mirror the areas a DVSA tester examines under the official MOT inspection manual. They can all be carried out at home without tools, and they cost nothing. Anything that cannot be assessed by eye, such as brake performance or emissions, is left to the test station.
KEY FACTS
- Lighting and signalling, tyres and number plates are among the most common reasons vehicles fail the MOT, and most are visible without tools.
- The maximum MOT fee for a car is £54.85, so a failed first attempt followed by a retest can cost more than the checks needed to prevent it.
- A free partial retest is available within 10 working days at the same centre if only minor repairs are needed and the rules are met.
- The DVSA defect grades are dangerous, major, minor and advisory; a major or dangerous defect is a fail.
- Driving without a valid MOT can bring a fine of up to £1,000 under the Road Traffic Act 1988.
Lights and signals
Lighting is one of the simplest areas to check and one of the most common to fail. Switch on the sidelights, dipped and main beam headlights, then walk around the car to confirm each one works. Repeat for the front and rear indicators, the hazard lights, the brake lights and the rear fog light. A second person makes checking the brake lights easier, or the reflection in a window or garage door can be used.
Look for cracked or heavily fogged lenses and confirm the colours are correct, with white or amber at the front and red at the rear. A registration plate lamp that has failed is easy to miss and is assessed during the test. Replacing a blown bulb before the MOT is far cheaper than booking a retest.
Tyres, wheels and number plates
Check each tyre for its tread depth, which must be at least 1.6mm across the central three quarters of the tread and around the full circumference. The wear bars moulded into the grooves give a quick visual guide. Look for cuts, bulges and exposed cords, any of which can be a major or dangerous defect.
Confirm the number plates are secure, clean and readable, with the correct font and spacing. A plate that is faded, cracked or fitted with incorrect spacing can be recorded as a defect. Make sure both plates are present and that nothing obscures the characters.
Glass, wipers and washers
The windscreen must give the driver a clear view. Damage larger than the permitted size in the driver's line of sight can fail, so a chip in front of the steering wheel is worth addressing first. Wiper blades that are split or leave smears can be recorded as a fault because they affect the ability to clear the screen.
Top up the washer fluid before the test, because an empty washer bottle that will not deliver fluid is an MOT item. Check that the horn sounds, that the seatbelts latch and retract, and that the driver and front passenger doors open from inside and outside.
Under the bonnet and on the dashboard
Several warning lamps are now part of the MOT. With the ignition on, a malfunction indicator lamp, an airbag warning lamp, an ABS warning lamp, a tyre pressure monitoring lamp or a brake fluid warning lamp that stays lit can lead to a failure. If any of these are on, the underlying fault should be investigated before the test.
Check the engine oil and coolant levels, as low fluid can trigger warning lamps, and confirm the brake fluid is between the marks. None of these home checks replace the tester's assessment of brakes, suspension, steering or emissions, which require equipment only a DVSA approved station has.
Timing the test and using the result
When the checks are done is worth a moment's thought. A test can be carried out up to a month, minus a day, before the current certificate runs out while keeping the same renewal date, which gives time to address any faults without losing days from the existing MOT. Working through the checklist a week or so ahead leaves room to replace a bulb or a wiper before the appointment.
If the car does fail, the result is recorded on the vehicle MOT history straight away, along with the reason. Reviewing that record shows exactly what the tester found and under which defect grade, which makes it easier to get the right repair done before returning for the retest. The certificate and the online history together provide the documentation an owner needs.
None of this changes the value of the pre test checks. Catching a blown bulb, a smeary wiper, an empty washer bottle or a soft tyre at home costs nothing and removes the most avoidable reasons a car is turned away. The test still decides the outcome, but the checklist tilts the odds towards a clean pass.
RELATED GUIDES
DISCLAIMER: This guide is general information, not professional advice. MOT rules and fees are set by the DVSA and can change. Check gov.uk for current requirements before acting.
Frequently Asked Questions
Does a pre MOT checklist guarantee a pass?
No. A checklist only covers the items a driver can see and reach. Brakes, emissions, suspension and steering are assessed with equipment at the test station, so a car can still fail on something the checklist cannot reveal. The aim is to remove avoidable failures such as a blown bulb.
What is the most common reason cars fail the MOT?
Lighting and signalling, tyres, and the driver's view of the road are consistently among the most common failure areas in DVSA data. Many of these are simple, visible items, which is why a pre test check can be worthwhile.
Will a dashboard warning light fail an MOT?
Some will. Warning lamps for the airbags, ABS, tyre pressure monitoring, brake fluid and the engine malfunction indicator are MOT items, and a lamp that stays lit can cause a failure. A fault should be diagnosed before the test.
How long do I have for a free retest?
A free partial retest is generally available within 10 working days at the same test centre if only specified minor repairs are needed. The exact rules are set by DVSA, so confirm them with the test station when booking.
