MOT Checklist: Pre-MOT Checks

Tick off the checks an owner can do at home before the MOT (lights, tyres, brakes, windscreen, wipers, seatbelts, horn and warning lamps) and see what is left to do.

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The Motwatch mot checklist is an interactive pre-MOT checklist for UK motorists preparing for their annual Ministry of Transport (MOT) examination. Many MOT failures are simple things such as a blown bulb, empty washer fluid or worn wiper blades. A fail means a retest, repair bills and, if the old MOT has run out, a car you cannot drive except to a repair or a pre-arranged test.

The checklist groups the checks across lighting, tyres, braking hydraulics, visibility, seatbelt mechanisms, and electronic warning lights. The score shows how much of this list you have checked; it is not a prediction of the tester’s result, and the MOT covers many more items.

Mot checklist example

How to use the mot checklist

  1. Inspect exterior vehicle lighting: Walk around the vehicle to verify that headlights, high beams, indicators, hazards, and brake lights illuminate brightly.
  2. Examine tyre tread depth across all wheels: Use a 20p coin or precision depth gauge to ensure tread exceeds the legal 1.6mm limit across the central three-quarters.
  3. Verify windscreen clarity in wiper sweep zone: Check that stone chips in wiper sweep Zone A do not exceed 10mm in diameter, or 40mm elsewhere.
  4. Test windscreen washer reservoir and wiper blades: Operate screen washer nozzles to confirm sufficient fluid spray and verify wiper rubber has no splits or smearing.
  5. Inspect seatbelt latching and retracting mechanisms: Pull each seatbelt sharply to confirm inertia-reel locking and verify webbings are free from cuts or fraying.
  6. Check dashboard diagnostic warning lamps: Turn on ignition to ensure ABS, airbag, engine management, and electronic stability control lamps illuminate and extinguish.
  7. Test horn and interior steering controls: Press the steering wheel horn to verify a loud, continuous single-tone warning sound.
  8. Check footbrake firmness and handbrake holding: Depress the footbrake pedal to ensure it feels firm without sinking, and pull the handbrake to verify cable tension.
  9. Calculate overall readiness rating score: Review the percentage of weighted checks done and the list of checks not ticked yet.
  10. Rectify identified defects before booking test: Replace failed bulbs or top up washer fluid before the test to avoid an easy fail.

What the MOT tester looks for

Common MOT Failure Categories and Defect Classification

The Driver and Vehicle Standards Agency (DVSA) classifies vehicle defects discovered during testing into three statutory categories: Minor, Major, and Dangerous. A Minor defect is recorded on the MOT certificate but results in a Pass. In contrast, a Major defect (such as a blown headlight bulb, a split wiper blade, or a tyre worn down to 1.5mm) results in an immediate Failure, requiring a re-test. A Dangerous defect indicates an immediate threat to road safety, meaning the vehicle cannot be legally driven on public roads even if the previous MOT certificate has not yet expired.

Lighting and Signalling: A Common Cause of MOT Failures

Lamps and signalling are among the most common MOT failure areas in DVSA statistics. Simple issues such as a £2 blown registration plate bulb or a misaligned headlight beam can immediately cause an MOT failure. Conducting a systematic walkaround check with an assistant operating brake pedals and indicator stalks allows motorists to catch these simple faults before testing.

Tyre Safety Tolerances and Sidewall Integrity

Tyres represent the sole contact patch between a vehicle and the road surface, making tyre condition a primary focus of MOT testers. Under UK construction and use regulations, passenger cars must maintain at least 1.6mm of continuous tread across the central three-quarters of the tyre breadth around its entire outer circumference. Furthermore, tyres must be completely free from deep cuts, sidewall bulges, tears, or exposed cords. Testers also examine tyre pressure monitoring system (TPMS) warning lights on cars first used from 1 January 2012; a TPMS warning lamp that stays on is a fail.

Windscreen Optical Zones and Damage Limits

Testers divide vehicle windscreens into distinct optical zones during the test. Zone A, defined as a 290mm wide vertical strip centered directly on the steering wheel within the swept area of the wipers, represents the driver’s primary line of sight. Within Zone A, any chip, crack, or scratch exceeding 10mm in diameter constitutes an immediate Major failure. In the remainder of the swept area (Zone B), damage up to 40mm is permitted. Identifying stone chips early allows motorists to arrange inexpensive resin repairs before small cracks propagate into mandatory windscreen replacements.

Frequently asked questions

What are the most common reasons cars fail the MOT test?

DVSA statistics put lamps, reflectors and electrical equipment, suspension, brakes and tyres among the most common failure areas.

Can I drive my car if it fails the MOT test with Major defects?

If your existing MOT certificate has not expired and no “Dangerous” defects were detected, you may drive it away to have defects repaired. However, driving a defective car can still result in police prosecution for driving an unroadworthy vehicle.

What is the difference between an MOT advisory and a failure?

An advisory note highlights a component that is beginning to wear (such as a tyre with 2.0mm tread or light brake disc corrosion) but still meets legal standards. An advisory does not cause a test failure.

Do I have to pay for an MOT re-test if my car fails?

If you leave the vehicle at the testing garage for repair and re-test within 10 working days, the re-test is completely free. If you take it away and bring it back within 10 working days, the test centre can charge a partial retest fee of up to half the maximum fee; some items are retested free if you return by the end of the next working day.

Can low screenwash fluid cause an MOT failure?

Yes. An empty windscreen washer reservoir or blocked washer jets is a major defect, so the car fails.

See all MOT Tools.